$\int cos^4\left(9x\right)sin^2\left(9x\right)dx$
$5ab+2ac+10mb+4mc$
$\lim_{x\to0}\left(\frac{\sqrt{2}-\sqrt{x+2}}{x}\right)$
$-6\left(-4a-7b-2\right)$
$4x^2-2y^2$
$\int_0^{cos\left(x\right)}\left(\sqrt{1+t^2}\right)dt$
$\left(ab+2c\right)^2$
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