$-3\cos\left(x\right)^2\sin\left(x\right)$

$2^{-3}\cdot2^9$

$cos\left(2x\right)=\sin\left(\frac{-1\pi}{2}+x\right)$

$\left(2y+\cos y\right)dy=6x^2dx$

$\cos\left(\frac{3}{5}-\frac{7}{25}\right)$

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

$\sqrt{3+6}+\sqrt{9}$