$\frac{1}{5x^2+10x+85}$
$7y'+4y=16x^2+4$
$3x\left(y^2+3\right)dx+y\left(x^2-2\right)dy=0$
$\lim_{x\to0}\left(\frac{cot\left(x\right)}{cot\left(3x\right)}\right)$
$4x^6-28x^3+49$
$\int15\cdot sin^2\left(3x\right)\cdot cos^4\left(3x\right)$
$180=\left(1.5+3x\right)$
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