$cos^2\left(a\right)-sin^2\left(a\right)=1-2\:sin^2\left(a\right)$
$\lim_{x\to0}\left(5t^4\cdot e^{\left(-2t\right)}\right)$
$\frac{a^5b^3}{ab}$
$3a+a-3a$
$\sqrt[3]{16a^4b^6}$
$8xy+1-\left(-1\right)$
$\left(5x^2\:y\right)\left(8w^4\right)$
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