$\int sec\left(x\right)^4csc\left(x\right)^2dx$
$\frac{dy}{dx}=-\frac{1}{x^2}+e^x\sin\left(3x\right)$
$3x^2-16x+9$
$cos^4\theta\:-sin^4\theta\:$
$\int\frac{3x^2+x+2}{x^3+2x^2}dx$
$6cos^2x+3sinx-3=0$
$x^2-x-20<0$
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