$y'=-30x^2y+25y-42x^2+35$
$5\cot^2x-2\cot x=0$
$x^5+2x^4-16x-32$
$\frac{cos^2x\cdot sen^2x+cos^4x}{sen^2x}$
$4x+2=10$
$\left|\left(-8+7\right)-\left(-2\right)\right|\cdot\left(-2\right)$
$100\left(x^2+3x\right)$
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