$25\cot^2\theta\:-16=0$
$\sin\left(2x\right)=1-\cos\left(4x\right)$
$-13-\left(-3\right)$
$\left(x^2+3x+1\right)\left(x^2-2\right)$
$\frac{2x+x^2}{x}$
$\frac{dy}{dx}=\frac{4x+5}{6y^2+16y+2}$
$x^2+24x+1$
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