$\frac{\cot\left(\frac{x}{2}\right)}{2}-\frac{\tan\left(\frac{x}{2}\right)}{2}$
$-\left(+3\right)-\left(-2+3\right)$
$\left(z-5w\right)\left(z+5w\right)$
$\int\left(\frac{1}{\sqrt{1024+16x^2}}\right)dx$
$cost^2+sent^2$
$5\cdot1-1$
$3.\:-2+5.4$
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