$-x^2-12x^2-3x^2+15x^2$
$\int5xln\sqrt{x}dx$
$4\:cos\:2a\:+\:3\:cos\:a\:=\:1$
$\left(4a^2-5b^3\right)\left(2a^2-3b^3\right)$
$9\left(-17\right)$
$\frac{1}{4}x\:+\:8;\:x=16$
$\left(x+5\right)\left(x-5\right)$
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