$\frac{\left(\sin x+\cos x\right)^2}{1+2\sin x\cos x}$
$\left(3x^2\:+\:5x\:+3\:\right)\left(x+1\right)$
$\lim_{x\to-1}\:3\left(2x-1\right)^2$
$\frac{dy}{dx}=100\left(y^2+4\right)$
$\frac{dy}{dx}=25$
$\left(-9x-4x\right)\left(-x+5\right)$
$-x^5+4x^4-4x^3=0$
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