$\frac{dy}{dx}=yx^2\cos\left(x\right)$
$-13b+4b-b$
$\left(5+b\right)\left(b-5\right)\left(b-3\right)\left(3+b\right)$
$842-12567$
$1-\frac{sen^2}{sec^2}=cos^4$
$\tan^2a+1=-3\sqrt{3}^2$
$24:6+8:2-15:3+4-2:-1$
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