$\int_{-\pi}^{\pi}\cos xln\left(\frac{1+x}{1-x}\right)dx$
$3x^2+4x=300$
$\frac{dy}{dx}=2x+4y$
$\left(x^4-2x\right)^2$
$28-32x=92$
$\frac{-3x}{2-6x^2}$
$cos\left(x\right)tan\left(x\right)+cot\left(x\right)=csc\left(x\right)$
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