$\frac{5\cos\left(t\right)}{9\sec^2\left(t\right)}$
$x^2+6x+16-\left(x+3\right)^2$
$\frac{8-x^4}{3-x^2}$
$\frac{d}{dx}15y^3$
$2cot2x=4$
$\sin\left(2a\right)-2\sin\left(a\right)$
$\int3\tan^5\left(6x\right)dx$
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