$\int\frac{1}{1+2x+x^2}dx$
$2a^2b-\frac{3}{2}a^2b-1$
$2\left(a+b\right)^2-5\left(a-b\right)^2+3a^2-4b$
$\left(x^2-3x+2\right)\cdot\left(x+2\right)$
$3x^2+10=7$
$\int5sin\left(x\right)\cdot\cos\left(x\right)dx$
$\int_c^4\left(2x+\frac{1}{x^2}\right)dx$
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