$$12j+2j-4+3j^2$$

$$\left|50\cdot\left(-2\right)\right|\cdot9$$

$$\left(3xy\right)mas\:\left(5x\right)^2$$

$$\sqrt[3]{729^6}$$

$$\int\left(7t+7\right)^{2.7}dx$$

$$\frac{d}{dt}\left(ae^{-kt}cos\left(t\right)\right)$$