$\tan^2\left(x\right)\cdot\left(1-\sin^2\left(x\right)\right)$
$\frac{4x^5-3x^2+x-+1}{2x^3-1}$
$-21\:-\:2\left(25\right)$
$\left(5x-10\right)\left(5x-11\right)+2$
$\int\frac{\sin^3\left(x\right)}{\cos^2\left(x\right)}dx$
$-125x^{a+1}-55x^{a+1}$
$\left(\frac{7x}{5}+\frac{9}{2}\right)^2$
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