$\frac{\sin^{2}t}{\cos t}=\sec t-\cos t$
$\frac{dy}{dx}\left(ay+bx=by-ax+\left(x+y\right)\sqrt{a^2-b^2}\right)$
$x^2+52x+169$
$-53x^2\left(-57x^2y\right)$
$\frac{d}{dx}2^{7x^2+x-7}$
$7x^3y^4-21x^4y^2+49x^2y^2$
$\frac{2\sqrt{5}\:-4}{\sqrt{5\:\:}-2}$
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