There are two terms I have trouble with simplifying:
1.)
$\dfrac{\tan^2(\gamma) -\cot^2(\gamma)}{4(2\sin^2(\gamma) - 1)} = ?$
The result is supposed to be $\dfrac{1}{4}$.
2.)
$2\sin^2(\delta) + \cos^4(\delta) - \sin^4(\delta) = ?$
For this one the result is supposed to be $1$.
How do I simplify these terms?