$\frac{\tan\left(x\right)}{\csc\left(x\right)\cdot\sec\left(x\right)}$
$\frac{d^2}{dx^2}\left(x^3+y^3=16\right)$
$\int\sin^4axda$
$\frac{d}{dx}\sqrt{x^2-7x}$
$4x<600$
$-3x^2+36x-108$
$\lim_{x\to0}\left(\frac{15x-5sin\left(3x\right)}{1-cos\left(9x\right)}\right)$
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