$\cos\left(2a\right)=1-2\sin\left(a\right)^2$
$\left(m^2+n^2\right)^2-\left(m^2-n^2\right)^2=100$
$\frac{d^2}{dx^2}\left(\ln\left(\frac{1+x}{1-x}\right)\right)$
$2a+ab\cdot2a+ab$
$-12\:-\:6p\:-\:\left(-2\right)$
$\frac{x}{37}=\:310.75$
$\left(4x^3+7y^3z^4\right)^2$
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