$\tanh\left(x\right)^2-\tanh x=0$
$\cos\left(a\right)\left(\tan\left(a\right)+\frac{\cos\left(a\right)}{1+\sin\left(a\right)}\right)$
$\left(8\right)\left(15.5\right)$
$t^2+29t-120$
$\frac{d}{dx}2x^2+xy+y^2=14$
$x^3+3x^2+3x+1$
$\frac{1}{cos^2}-tana$
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