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2*cos(x)-sin(2x)=0 la ecuación

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Solución numérica:

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Solución

Ha introducido [src] 
2*cos(x) - sin(2*x) = 0
−sin⁡(2x)+2cos⁡(x)=0- \sin{\left(2 x \right)} + 2 \cos{\left(x \right)} = 0
Simplificar
Gráfica
0-80-60-40-2020406080-1001005-5
Trazar el gráfico f1(x)
Trazar el gráfico f2(x)
Respuesta rápida [src] 
     -pi 
x1 = ----
      2
x1=−π2x_{1} = - \frac{\pi}{2} 
     pi
x2 = --
     2
x2=π2x_{2} = \frac{\pi}{2} 
x2 = pi/2
Suma y producto de raíces [src] 
suma
  pi   pi
- -- + --
  2    2
−π2+π2- \frac{\pi}{2} + \frac{\pi}{2} 
=
0
00 
producto
-pi  pi
----*--
 2   2
−π2π2- \frac{\pi}{2} \frac{\pi}{2} 
=
   2 
-pi  
-----
  4
−π24- \frac{\pi^{2}}{4} 
-pi^2/4
Respuesta numérica [src] 
x1 = 26.7034393676549
x2 = 14.137087451379
x3 = 64.4026120631021
x4 = -80.1105783828951
x5 = 64.402749985003
x6 = -36.1283932235321
x7 = -70.6858347057703
x8 = -23.5619901092509
x9 = -95.8185759344887
x10 = 29.845130209103
x11 = 80.1106126665397
x12 = -64.4026493985908
x13 = 36.1283155162826
x14 = 73.8274273593601
x15 = -39.2699081698724
x16 = -7.85398163397448
x17 = 98.9601685880785
x18 = 51.8363266129711
x19 = -29.8451151764072
x20 = 23.5619449019235
x21 = 92.6769832808989
x22 = 20.4203109469995
x23 = 45.5531998278876
x24 = -89.5353906273091
x25 = -61.2611612947608
x26 = 4.71238898038469
x27 = -26.7035375555132
x28 = 7.85402509748832
x29 = -67.5442911095362
x30 = -73.8274109605032
x31 = -80.1106700221811
x32 = -36.1282765608558
x33 = 86.3937979737193
x34 = -45.553093477052
x35 = -73.827404839395
x36 = -83.2522053201295
x37 = 14.1371748702372
x38 = 95.8186280030328
x39 = 6806.26055666465
x40 = 20.42030673321
x41 = -17.2788609840697
x42 = 48.6946861306418
x43 = 70.6857397600493
x44 = -20.4203522483337
x45 = -86.3937014243547
x46 = 58.1194603109949
x47 = 17.2787595947439
x48 = 61.261056745001
x49 = -51.8362787842316
x50 = -58.1194640914112
x51 = -14.1371669411541
x52 = -23.5620274181456
x53 = 7.85388676661539
x54 = -1.5707963267949
x55 = 42.4115008234622
x56 = -42.4114009567849
x57 = 67.5442420521806
x58 = -29.8451590169879
x59 = 1.5708994604091
x59 = 1.5708994604091
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