$\sin\left(2x\right)dy=y\cos\left(2x\right)dx$

$\left(\frac{2}{3}\right)^{-2}+\sqrt{3^2}$

$2\cdot x+40=52$

$6m\cdot7m^2$

$\frac{d^3}{dx^3}\left(x^2\cdot\left(x+4\right)\right)$

$cos\left(x\right)sen\left(y\right)=\frac{1}{2}sen\left(x+y\right)-\frac{1}{2}sen\left(x-y\right)$

$\lim_{x\to-1}\left(x^3-4x+1\right)$