Posted by **Sarah Fuller** on Tuesday, March 9, 2010 at 8:32pm.

prove:

cos*2x=csc*2x-2/csc*2x

- trig -
**bobpursley**, Tuesday, March 9, 2010 at 8:43pm
I think you must be usint * as the power to, as in ^

right side: (csc^2 x - 2)/csc^2 x

(1-2sin^2x) = 1-2(1-cos^2x)=-1+2cos^2x

which is clearly not an identity.

So I am not certain what your problem is.

- trig -
**Reiny**, Tuesday, March 9, 2010 at 8:47pm
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 x-2/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.

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