$\frac{\cot\left(x\right)}{1-\sin\left(x\right)}=\tan\left(x\right)+\cot\left(x\right)$
$\frac{dy}{dx}=\left(x+b\right)^2$
$20\cdot99$
$7d+4d$
$\int sin\left(-7y\right)cos\left(3y\right)dy$
$\left(2x^2-y\right)^4$
$\int\log y^3dy$
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