$4cos^23x-3=0$
$\frac{9^2}{4}+ab+b^2$
$\int\left(x^2\frac{1}{\sqrt{1+x^2}}\right)dx$
$\int3x\sqrt{1-2x}dx$
$-12\left(-2\right)+4\left(-3+5\right)$
$\frac{x^5}{x^2+1}$
$\int_{12}^{15}\left(5\right)^{-1}e^{-5\cdot x}dx$
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