$\cos\left(3a\right)=\cos^3\left(a\right)-3\sin^2\left(a\right)\cos\left(a\right)$
$\lim_{x\to0}\left(e^x+sin\right)$
$\left(3x\:2y\right)^2$
$3a+2b-c+4c+b$
$4x^2y-6x^2-3y^22y^3$
$\int\sqrt{49+64x^2}dx$
$\left(3m-n\right)\left(3m+n\right)$
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