$\frac{1}{1-\sin\left(x\right)}+\frac{1}{1+\sin\left(x\right)}=2\cos\left(x\right)^2$
$3x^3-20x^2+37x-20$
$\int_1^{10}\frac{x}{x^2-4}dx$
$\frac{8}{5}ab+\frac{13}{5}ab$
$\left(4a^4-7y^2\right)^2$
$6x\left(-10\right)$
$-\frac{5}{3}r-3r$
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