$\int\left(5x\sqrt{4-x^2}\right)dx$
$\sin^2\:30+\cos^245+tg^260$
$2-85-8$
$\frac{8u^4v^2}{5u^3\cdot6u^4v^3}$
$+1-\left(+3-\left(-8\right)-\left(+8\right)\right)+\left(+6+\left(+8\right):\left(+4\right)\right)$
$7p+p+4p+2p-6$
$\frac{dx}{dt}=\frac{1+x}{1+t}$
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