$x^3+y^3dx=2xy^2dy$
$-0,3-0,7$
$\frac{d^2y}{dx^2}-4=0$
$\frac{\sin\left(x\right)+\tan\left(x\right)}{1+\cos\left(x\right)}-\frac{\sin2\left(x\right)}{2\cos^2\left(x\right)}$
$x2+2\cdot1-x$
$\left(x+z-1\right)\left(x+z+1\right)$
$\int e^{2x+3}dx$
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