$\frac{dy}{dx}\left(15x=15y+5y^3+3x^3\right)$
$\left(9x-8y\right)^2$
$\frac{1+\cos a}{1-\cos a}=\left(\csc a+\cot a\right)^2$
$sin\left(a+b\right)-sin\left(a-b\right)=2\:cos\:a\:sin\:b$
$\frac{d}{dx}\sqrt{x}^{7x}$
$\left(2x-3\right)\left(6x-1\right)$
$\left(\:x^4\:-\:2x^2\:\:-\:3\:\:\:\right)$
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