$3x+\left\{2x-3y+4\right\}-5y$
$\frac{\left(1+sinx\right)^2}{cos^2x}$
$\left(y^4x\right)\frac{dy}{dx}=1+x$
$-\frac{5}{2}x+13=18$
$-2^2\:times\:3n^3$
$\int\frac{4x^2+2x+8}{x\left(x+2\right)^2}dx$
$xdx=-ydy$
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