$$\frac{d}{dx}\:\:\frac{x^2}{a^2}+\frac{y^2}{b^2}=3x^2y^3$$

$$5\sin^2-1=\sin^2$$

$$\left(4n-2f+6\right)^2$$

$$2\cdot\left(15-3\right)-\left(11-\left(7-3\right)\right)$$

$$\frac{dy}{dx}=3sen2x$$

$$-\left(-5-2\right)+\left(6+12\right)-\left(-4\right)-3$$

$$\frac{e^x}{e^{-2x}}$$