$\frac{dy}{dx}\left(y=\ln\left(x^2+y^2\right)\right)$

$20=14$

$\left(3a\right)^3:3a^2-7a+2.\left(a^3\:\right)^2-5.\left(a^{10}:a^4\:\right)$

$\lim_{x\to0}\left(\frac{\left(8^{\sqrt{x}}-1\right)}{1-3^{\sqrt{x}}}\right)$

$10x^8y\cdot3$

$\frac{4x^3}{2x^2}$

$\int_{\frac{x}{2}}^{2\pi}3\cos\left(x\right)dx$