$\int_0^{\frac{\pi}{2}}\frac{2}{3}\sqrt{9-x^2}dx$
$2x^2\left(3x^2-2x\right)-3x\left(x^3-3x^2\right)$
$\frac{7}{x^2-3x-10}$
$3x^2+x^3\cdot x^3-2x^2\cdot1-x^7$
$\left(-15\right)-\left(-10\right)-\left(+3\right)-\left(-7\right)$
$a+ab$
$\left(2x+1\right)^2-2\left(2x^2-1\right)$
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