trig
posted by Sarah Fuller .
prove:
cos*2x=csc*2x2/csc*2x

I think you must be usint * as the power to, as in ^
right side: (csc^2 x  2)/csc^2 x
(12sin^2x) = 12(1cos^2x)=1+2cos^2x
which is clearly not an identity.
So I am not certain what your problem is. 
Your use of * in the last 3 posts will cause confusion
traditionally
* means multiplication
/ means division and
^ means "to the exponent"
so you want to say
cos^2 x=csc^2 x2/csc^2 x
but that statement is not true for all x's, I just tried any x and it did not work.
Use brackets to establish the proper order of operations.