$\sec\left(\pi\right)\cdot\tan\left(\pi\right)\cdot\left(-2\right)$
$3\cdot0^4-5\cdot0^2-1$
$x^5\left(2x\right)^3$
$\tan\left(y\right)\frac{dx}{dy}+x=0$
$x^2+x=12$
$4x^2y-7x^2y^3$
$y'-y=1\:;y\left(0\right)=1$
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