$tan\:x=\:\frac{sin\left(x+2\pi\:\right)}{cos\left(x-2\pi\:\right)}$
$a^4-4a^2-16$
$2y^3+5y+y^3-4y-2$
$-3\frac{1}{2}\:x\:-2\frac{3}{4}$
$\frac{7^2}{7^{-2}}$
$\left(x+3y\right)^7$
$\frac{64a^2-y^2}{8a-y}$
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