If we establish an identity, -sinAcscA - sin^(2)A - cos^(2)A - tanAcotA would equal....
does it equal 3cos^(2)A - 1 or 3cos^(2)A - 2sin^(2)A?
Who gave you the possible answers for this?
$\displaystyle -sin(A) \cdot csc(A) - sin^2(A) - cos^2(A) - tan(A) \cdot cot(A)$
$\displaystyle - sin(A) \cdot \frac{1}{sin(A)} - (sin^2(A) + cos^2(A)) - tan(A) \cdot \frac{1}{tan(A)}$
$\displaystyle -1 - (1) - 1 = -3$
I smell a typo somewhere...
-Dan