$\frac{d^2}{dx^2}\left(cos\:\left(5x+3\right)\:\right)$

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

$\frac{\left(cot^2x+1\right)}{cscx}-cscx$

$-\left(-13\right)-\left(-7\right)$

$2\left(-1-2\right)-1-2-4\left(3-7+3\right)$

$\frac{d}{dx}\sqrt[3]{x^8}$

$\left(4a^{3}-5b^{2}\right)\left(4a^{3}+5b^{2}\right)$