$\tan\left(a\right)=\sin\left(a\right)^2\sec\left(a\right)^2$
$-4\cdot2+2$
$-2\left(5y\:+\:4\right)\:-\:4$
$\int\left(\cos^4\left(x\right)\sin\left(2x\right)\right)dx$
$\lim_{x\to\infty}\left(e^{-\sqrt{x}}\right)$
$\frac{c}{x}=3a$
$x^{2\:}\:-\:4x=17$
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