$\left(5x^3+y^4\right)^2$

$\frac{2}{x}=\frac{x}{2}$

$\lim_{x\to1}\left(\frac{sen\left(x\right).cos\left(x\right)}{x+sen\left(2x\right)}\right)$

$28=9x-8$

$\frac{30\cdot\sin\left(x\right)}{2\cdot\sin\left(x\right)}$

$\left(xy^4-x^2y\right)^3$

$\frac{dy}{dx}=e^{7x+8y}$