$\int\frac{2}{3}\left(1-x^2\right)^{\frac{3}{2}}dx$
$x^2\ge-4$
$\int x\sec\left(2x^2-5\right)dx$
$x^6+3x^2$
$\frac{tanx}{cos^2x}=\frac{sec^2x}{cotx}$
$x^2+10x+-25$
$e^{\sin\left(6x+3y-18\right)}\cos x^2y^4$
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