pi -- 2 / | | a | cot (1) | ------- dx | cos(x) | / 0
Integral(cot(1)^a/cos(x), (x, 0, pi/2))
/ | | a | cot (1) | ------- dx | cos(x) | /
a cot (1) ------- cos(x)
cos(x)
a a cot (1) cot (1)*cos(x) ------- = -------------- cos(x) 2 cos (x)
sin(a)^2 + cos(a)^2 = 1
2 2 cos (x) = 1 - sin (x)
a a cot (1)*cos(x) cot (1)*cos(x) -------------- = -------------- 2 2 cos (x) 1 - sin (x)
u = sin(x)
/ | | a | cot (1)*cos(x) | -------------- dx = | 2 | 1 - sin (x) | /
/ | | a | cot (1)*cos(x) | -------------- dx = | 2 | 1 - sin (x) | /
/ | | a | cot (1) | ------- du | 2 | 1 - u | /
a a cot (1) cot (1) / 1 1 \ ------- = -------*|----- + -----| 2 2 \1 - u 1 + u/ 1 - u
/ / / \ | | | | a | | 1 | 1 | / cot (1)*| | ----- du + | ----- du| | | | 1 + u | 1 - u | | a | | | | | cot (1) \/ / / = | ------- du = ----------------------------------- | 2 2 | 1 - u | /
= -cot(1)^a*(log(-1 + u)/2 - log(1 + u)/2)
u = sin(x)
/ | | a | cot (1) a /log(1 + sin(x)) log(-1 + sin(x))\ | ------- dx = cot (1)*|--------------- - ----------------| + C0 | cos(x) \ 2 2 / | /
/ | | a | cot (1) a /log(1 + sin(x)) log(-1 + sin(x))\ | ------- dx = C + cot (1)*|--------------- - ----------------| | cos(x) \ 2 2 / | /
a / a \ pi*I*cot (1) oo*sign\cot (1)/ + ------------ 2
=
a / a \ pi*I*cot (1) oo*sign\cot (1)/ + ------------ 2
oo*sign(cot(1)^a) + pi*i*cot(1)^a/2
Estos ejemplos se pueden aplicar para introducción de los límites de integración inferior y superior.