$\frac{4\sin\left(x\right)}{\cos^2\left(x\right)}$
$-11-\left(3-14\right)-15$
$5n^2+13n-5$
$\frac{x}{x^2+4}-\frac{1}{x-2}$
$5x\left(x^3+1\right)-\left(x^4+2x^2+3\right)\cdot\left(-2x^3\right)$
$\left(3x+2y\right)\left(2x+4y\right)$
$x-3\le2x+5$
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