S=cosec x+cosec2x+cosec4x+....+cosec2^(n)x=cot(x)/(2)-cot2^(n)x

S=cosecx+cosec 2x+cosec 4x+…+cosec 2nx=cot(x/2)−cot2nx

int (sec x cosec x)/(2 cot x- sec x cosec x)dx=

" cosec 2x + cot 2x = cot x "

int e^cot x cosec^2xdx

int ("cosec"^(2)x)/((1-cot^(2)x))dx=?

log("cosec x"-cot x)

int cosec^2 x dx=- cot x

csc x=1+cot x

Prove that : cosec theta + cosec 2 theta + cosec 2^2 theta +...........+cosec2^(n-1) theta= cot(theta/2)-cot 2^(n-1)theta