Para hallar los extremos hay que resolver la ecuación
$$\frac{d}{d x} f{\left(x \right)} = 0$$
(la derivada es igual a cero),
y las raíces de esta ecuación serán los extremos de esta función:
$$\frac{d}{d x} f{\left(x \right)} = $$
primera derivada$$x^{\sin{\left(\pi x \right)}} \left(\pi \log{\left(x \right)} \cos{\left(\pi x \right)} + \frac{\sin{\left(\pi x \right)}}{x}\right) = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = 19.5017490094545$$
$$x_{2} = 57.5004348922392$$
$$x_{3} = 45.5005832814248$$
$$x_{4} = 25.5012267688739$$
$$x_{5} = 41.5006552933046$$
$$x_{6} = 15.5023844354396$$
$$x_{7} = 77.5003005241291$$
$$x_{8} = 81.5002825065307$$
$$x_{9} = 23.5013655948116$$
$$x_{10} = 87.500258954712$$
$$x_{11} = 29.5010147918644$$
$$x_{12} = 39.500697720819$$
$$x_{13} = 95.5002327093841$$
$$x_{14} = 89.5002518949765$$
$$x_{15} = 51.500499133648$$
$$x_{16} = 83.5002742292025$$
$$x_{17} = 85.5002663895521$$
$$x_{18} = 69.5003437248215$$
$$x_{19} = 37.5007454665031$$
$$x_{20} = 75.5003103501492$$
$$x_{21} = 31.5009322971412$$
$$x_{22} = 91.5002451834337$$
$$x_{23} = 13.5028827293393$$
$$x_{24} = 27.5011116448589$$
$$x_{25} = 71.5003318902279$$
$$x_{26} = 61.5003999684073$$
$$x_{27} = 33.5008612748194$$
$$x_{28} = 3.52280102016443$$
$$x_{29} = 9.50473369645658$$
$$x_{30} = 21.5015358699427$$
$$x_{31} = 93.5002387956481$$
$$x_{32} = 73.500320786611$$
$$x_{33} = 65.5003698847997$$
$$x_{34} = 11.503605658404$$
$$x_{35} = 63.5003843847485$$
$$x_{36} = 53.5004758751014$$
$$x_{37} = 5.51076872035014$$
$$x_{38} = 67.5003563624568$$
$$x_{39} = 79.5002912579924$$
$$x_{40} = 59.5004167574861$$
$$x_{41} = 47.5005524976704$$
$$x_{42} = 1.62257359090008$$
$$x_{43} = 17.5020224999823$$
$$x_{44} = 97.500226904367$$
$$x_{45} = 7.50669485268483$$
$$x_{46} = 55.500454535085$$
$$x_{47} = 35.5007995527148$$
$$x_{48} = 49.5005245714587$$
$$x_{49} = 43.5006173669394$$
$$x_{50} = 99.5002213620728$$
Signos de extremos en los puntos:
sin(1.50174900945455*pi)
(19.501749009454546, 19.5017490094545 )
sin(1.50043489223918*pi)
(57.500434892239184, 57.5004348922392 )
sin(1.5005832814248*pi)
(45.5005832814248, 45.5005832814248 )
sin(1.50122676887392*pi)
(25.501226768873916, 25.5012267688739 )
sin(1.50065529330456*pi)
(41.50065529330456, 41.5006552933046 )
sin(1.5023844354396*pi)
(15.5023844354396, 15.5023844354396 )
sin(1.50030052412909*pi)
(77.50030052412909, 77.5003005241291 )
sin(1.5002825065307*pi)
(81.5002825065307, 81.5002825065307 )
sin(1.50136559481162*pi)
(23.50136559481162, 23.5013655948116 )
sin(1.50025895471195*pi)
(87.50025895471195, 87.500258954712 )
sin(1.50101479186437*pi)
(29.501014791864375, 29.5010147918644 )
sin(1.50069772081905*pi)
(39.50069772081905, 39.500697720819 )
sin(1.50023270938412*pi)
(95.50023270938412, 95.5002327093841 )
sin(1.50025189497646*pi)
(89.50025189497646, 89.5002518949765 )
sin(1.50049913364796*pi)
(51.500499133647956, 51.500499133648 )
sin(1.5002742292025*pi)
(83.5002742292025, 83.5002742292025 )
sin(1.50026638955205*pi)
(85.50026638955205, 85.5002663895521 )
sin(1.50034372482146*pi)
(69.50034372482146, 69.5003437248215 )
sin(1.50074546650314*pi)
(37.50074546650314, 37.5007454665031 )
sin(1.50031035014919*pi)
(75.50031035014919, 75.5003103501492 )
sin(1.50093229714118*pi)
(31.500932297141183, 31.5009322971412 )
sin(1.50024518343373*pi)
(91.50024518343373, 91.5002451834337 )
sin(1.50288272933928*pi)
(13.50288272933928, 13.5028827293393 )
sin(1.50111164485893*pi)
(27.50111164485893, 27.5011116448589 )
sin(1.5003318902279*pi)
(71.5003318902279, 71.5003318902279 )
sin(1.50039996840725*pi)
(61.50039996840725, 61.5003999684073 )
sin(1.50086127481938*pi)
(33.50086127481938, 33.5008612748194 )
sin(1.52280102016443*pi)
(3.522801020164427, 3.52280102016443 )
sin(1.50473369645658*pi)
(9.504733696456576, 9.50473369645658 )
sin(1.5015358699427*pi)
(21.5015358699427, 21.5015358699427 )
sin(1.50023879564809*pi)
(93.50023879564809, 93.5002387956481 )
sin(1.50032078661104*pi)
(73.50032078661104, 73.500320786611 )
sin(1.50036988479974*pi)
(65.50036988479974, 65.5003698847997 )
sin(1.50360565840399*pi)
(11.503605658403993, 11.503605658404 )
sin(1.50038438474849*pi)
(63.500384384748486, 63.5003843847485 )
sin(1.50047587510142*pi)
(53.50047587510142, 53.5004758751014 )
sin(1.51076872035014*pi)
(5.51076872035014, 5.51076872035014 )
sin(1.50035636245683*pi)
(67.50035636245683, 67.5003563624568 )
sin(1.50029125799242*pi)
(79.50029125799242, 79.5002912579924 )
sin(1.50041675748614*pi)
(59.50041675748614, 59.5004167574861 )
sin(1.50055249767036*pi)
(47.50055249767036, 47.5005524976704 )
sin(1.62257359090008*pi)
(1.6225735909000836, 1.62257359090008 )
sin(1.50202249998232*pi)
(17.502022499982317, 17.5020224999823 )
sin(1.50022690436695*pi)
(97.50022690436695, 97.500226904367 )
sin(1.50669485268483*pi)
(7.506694852684833, 7.50669485268483 )
sin(1.50045453508502*pi)
(55.50045453508502, 55.500454535085 )
sin(1.50079955271479*pi)
(35.50079955271479, 35.5007995527148 )
sin(1.50052457145874*pi)
(49.50052457145874, 49.5005245714587 )
sin(1.50061736693939*pi)
(43.50061736693939, 43.5006173669394 )
sin(1.50022136207275*pi)
(99.50022136207275, 99.5002213620728 )
Intervalos de crecimiento y decrecimiento de la función:Hallemos los intervalos donde la función crece y decrece y también los puntos mínimos y máximos de la función, para lo cual miramos cómo se comporta la función en los extremos con desviación mínima del extremo:
Puntos mínimos de la función:
$$x_{1} = 19.5017490094545$$
$$x_{2} = 57.5004348922392$$
$$x_{3} = 45.5005832814248$$
$$x_{4} = 25.5012267688739$$
$$x_{5} = 41.5006552933046$$
$$x_{6} = 15.5023844354396$$
$$x_{7} = 77.5003005241291$$
$$x_{8} = 81.5002825065307$$
$$x_{9} = 23.5013655948116$$
$$x_{10} = 87.500258954712$$
$$x_{11} = 29.5010147918644$$
$$x_{12} = 39.500697720819$$
$$x_{13} = 95.5002327093841$$
$$x_{14} = 89.5002518949765$$
$$x_{15} = 51.500499133648$$
$$x_{16} = 83.5002742292025$$
$$x_{17} = 85.5002663895521$$
$$x_{18} = 69.5003437248215$$
$$x_{19} = 37.5007454665031$$
$$x_{20} = 75.5003103501492$$
$$x_{21} = 31.5009322971412$$
$$x_{22} = 91.5002451834337$$
$$x_{23} = 13.5028827293393$$
$$x_{24} = 27.5011116448589$$
$$x_{25} = 71.5003318902279$$
$$x_{26} = 61.5003999684073$$
$$x_{27} = 33.5008612748194$$
$$x_{28} = 3.52280102016443$$
$$x_{29} = 9.50473369645658$$
$$x_{30} = 21.5015358699427$$
$$x_{31} = 93.5002387956481$$
$$x_{32} = 73.500320786611$$
$$x_{33} = 65.5003698847997$$
$$x_{34} = 11.503605658404$$
$$x_{35} = 63.5003843847485$$
$$x_{36} = 53.5004758751014$$
$$x_{37} = 5.51076872035014$$
$$x_{38} = 67.5003563624568$$
$$x_{39} = 79.5002912579924$$
$$x_{40} = 59.5004167574861$$
$$x_{41} = 47.5005524976704$$
$$x_{42} = 1.62257359090008$$
$$x_{43} = 17.5020224999823$$
$$x_{44} = 97.500226904367$$
$$x_{45} = 7.50669485268483$$
$$x_{46} = 55.500454535085$$
$$x_{47} = 35.5007995527148$$
$$x_{48} = 49.5005245714587$$
$$x_{49} = 43.5006173669394$$
$$x_{50} = 99.5002213620728$$
La función no tiene puntos máximos
Decrece en los intervalos
$$\left[99.5002213620728, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, 1.62257359090008\right]$$