$\:2a^2+6a^2$
$\frac{2+\tan^2\left(t\right)}{\sec^2\left(t\right)}-1$
$9+12f+4f^2$
$\int2a^2xda$
$\int_0^{\pi}\left(\pi\left(\sin\left(x\right)\right)^2\right)dx$
$-cos\left(x\right)=cos\left(x\right)$
$\frac{4x^2+3}{x-2}$
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