$\int\left(\frac{5x-21}{x^2-8x+15}\right)dx$
$0.34\cdot20$
$2x^2+10x+7=0$
$\lim_{x\to\infty}\left(\frac{5x^3+1}{2x^2+x-5}\right)$
$\int_0^{\frac{1}{2}}\frac{sen^{-1}}{\sqrt{1-x^2}}dx$
$\left(+4\right)x\left(-2\right)$
$2a^3bc^2+3a$
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