$$y^4+4y^3+4y^2=0$$

$$\frac{dy}{dx}=4xy=8$$

$$\left(2a-3a^2\right)^2$$

$$\frac{d^5y}{dx^5}\left(2x^2-5x^3+7x\right)$$

$$\left(-74\right)-\left(-61\right)$$

$$\lim_{x\to\frac{\pi}{4}}\left(\frac{9tan\left(x\right)-9cot\left(x\right)}{x-\frac{\pi}{4}}\right)$$

$$-8y^7\left(-3y\right)$$