$-7x+4x^2+5x+9x^2-3$
$5cos2x=2$
$2x+7=-3$
$\frac{1}{2}\cdot\sqrt{x^2+y^2}\cdot\sqrt{x^2+6x+9+y^2}$
$y'\:=-\frac{y}{x}+\frac{1}{x^2}$
$\int_0^1\left(\frac{4-2x}{\sqrt{1-x^2}}\right)dx$
$641+30$
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