Help with a Trig Identity Problem

If we establish an identity, sinAcscA - sin2A could equal which of the following quantities?

1
cos^(2) x A
sin^(2) x A – 1
tan^(2) x A

thanks

Quote:

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Originally Posted by andy11

If we establish an identity, sinAcscA - sin2A could equal which of the following quantities?

1
cos2A
sin2A – 1
tan2A

thanks

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$\displaystyle sin(A)csc(A) - sin^2(A)$<-- I had to be a bit of an oracle here!

$\displaystyle = \frac{sin(A)}{sin(A)} - sin^2(A)$

$\displaystyle = 1 - sin^2(A) = cos^2(A)$

-Dan