$\frac{\left(3x^4+2x^3-5x^2+x+1\right)}{x-1}$
$-5\left(-21\right)$
$2\:tan^2\left(x\right)=sec\:\left(x\right)\tan\left(x\right)$
$15x^4+22x^3$
$\frac{dy}{dx}+2\left(cot\left(x\right)\right)y=4\left(cos\left(x\right)\right)y^{\frac{1}{2}}$
$y+y=5\cos x$
$x-4<6$
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