$cos\left(270+x\right)=\:-\cos\left(x\right)$
$4x^2-10$
$\int\frac{7x^2-4}{x^3-x^2-2x}dx$
$-3\left(2x^6y^{-4}\right)^{-2}$
$\frac{\left(tan\:x\right)}{cos\:x}$
$\left(a-\frac{2}{3}\right)\left(a+\frac{1}{4}\right)$
$\sqrt{x}=-3$
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