$\frac{d}{dx}\sin\sqrt{x}\cos\sqrt{x}$
$\left(a+6b^2\right)\left(a-4b+2x\right)$
$\frac{4}{3}\cdot60$
$30ax^2-15x^310axy^2-20x^2y^2$
$-4xy^2\left(15x^3y^2\right)$
$\int sec^2\:\left(2-7x^3\right)\:3x^2\:dx$
$\lim_{x\to0}\left(\frac{cos3x}{cos2x}\right)$
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