$\sec^2x-2\tan x$
$\left(-4x^2y+2y\right)^2$
$x^{-4}x^{-5}x^9y^3$
$\sqrt[0]{16}$
$4k-6+8k+k$
$\int\left(2^{2x^2+3}\cdot4x\right)dx$
$\cos\left(30\right)\cdot\cos\left(20\right)+\sin\left(30\right)\cdot\sin\left(20\right)$
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