$\frac{\sin\left(x\right)}{1-\cos\left(x\right)}\cdot\frac{\cos\left(x\right)}{\sin\left(x\right)}$

$\sin\left(x\right)\left(-\sin\left(x\right)\right)-\left(\cos\left(x\right)\left(\cos\left(x\right)\right)\right)$

$2-2sin\left(x+15\right)=3$

$\int_0^8\left(\cos\left(\pi x\right)\right)dx$

$-9512-\left(-1963\right)$

$a^{-2x}$

$\frac{1}{3^{2n-1}}$