$3 \cdot 3,4 - 4$
$y'=cos^2x\left(cos^2y\right)$
$\frac{10}{sec2x-1}$
$5x\left(a+2\right)-a-1$
$\left(x+10\right)\left(x-13\right)$
$\int\frac{1}{\left(5+7x^2\right)}dx$
$4\sin^2\left(r\right)-\sin\left(r\right)=0$
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