Question

how to integrate cosec 2x

Answer 1

did you mean:

\[\int\limits \csc^2(x)dx\]

Answer 2

Lilli: Use Equation Editor if at all possible. Kainui has done you a favor by asking for clarification.

If you meant Integral (csc 2x), see the following:

http://math2.org/math/integrals/more/csc.htm

If you meant Integral (csc x)^2, think of the Pythagorean identity that applies here.

Answer 3

@mathmale I don't think the pythagorean identity is really all that useful here.

If the integral is (cscx)^2 and you know that:

\[\frac{ d }{dx }\cot(x)=-\csc^2(x)\]

Then you pretty much have the answer.