$\sin x\:=\:0,5$
$\left(2xy+2x+y+2\right)dx+\left(x^2+x-1\right)dy=0$
$4\left(-2\right)\left(3\right)-2\left(3\right)^{2}-\left(-2\right)^{2}$
$\left(-99\right)-\left(-61\right)$
$\:\int_0^p\left(xseny\right)dy$
$2\left(x+3\right)=8$
$x^3-8^3$
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