$3senxdy\:=\:2ycosxdx$
$y^3=\sqrt{9x^2+4}$
$\frac{dy}{dx}-xy=5x$
$3x-6y+15z$
$\int x^3\sqrt{x^2-1}dx$
$7y+3xy-1xy+14x-2y+5x-5y$
$\frac{\cos^{2}\alpha\left(1+\tg^{2}\right)}{\cot g\alpha}=\tg\alpha$
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