$x^2-4+ax-2a$
$\int\frac{1}{y^3\sqrt{y^2-9}}dx$
$6^2-10a\:+\:24$
$\left(9+4-7\right)\cdot9$
$3x^{-\frac{5}{3}}$
$\int\left(cosx+4cos^3x\right)dx$
$\cos^2+\cos^2\cdot\cot^2$
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