$\left(+17\right)-\left(-20\right)+\left(34\right)-\left(+11\right)$

$\cos\left(2x\right)=2\cos^2\left(u\right)-1$

$3\sin^2\left(x\right)=\sin\left(x\right)$

$\left(-8gc-8m+n\right)^2$

$\left(xz^4\right)^3$

$2\sin^2\left(60\right)-5\sin\left(60\right)=-2$

$\frac{d}{dx}\sqrt[3]{\frac{x^2}{\sqrt{x}^2+4}}$