$-cos\left(x\right)sin\left(y\right)sin\left(z\right)\:+\:cos\left(x\right)cos\left(y\right)cos\left(z\right)\:+\:cos\left(x\right)sin\left(y\right)$
$\tan\left(x\right)\cdot\sec\left(x\right)\tan\left(x\right)$
$-0.399=log\left(x\right)$
$4x^2-40x+y+47=0$
$\frac{dy}{dx}\:sin^2\:\left(e^x\right)$
$-7x^2-18x-7y^2=7$
$\left(a^2+2\right)\left(a^2+9\right)$
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