$\left\{70-\left[40-\left(-50+30\right)-30\right]\right\}-20$

$sin\:=-11$

$\sqrt{m^{\frac{1}{2}}}+n^2-9$

$\frac{dy}{dx}=y\left(\frac{\sqrt{x}}{2}-\frac{2}{\sqrt{x}}\right)$

$\int\left(10x+9\right)\cdot e^{5x^2+9x-1}\:dx$

$\int-5sin^3xcosxdx$

$dy=e^{2y}\sin\left(x\right)dx$