$\frac{cos\left(x\right)+tan\left(x\right)}{sec\left(-x\right)}$
$76.12-16.67$
$\frac{cos\left(a+b\right)}{sin\left(a\right)cos\left(b\right)}$
$\frac{dy}{dx}\left(\:x^4+y^4-4axy=0\right)$
$4x^2-32x+7$
$p'=1-p$
$\frac{d}{dx}\sqrt{f}-\sqrt[3]{f}$
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