$\int\frac{7x}{\sqrt{3x+1}}dx$

$-5m^xn^2x^3\cdot\frac{3}{5}m^{a+x}n^{x+2}x^6$

$\int\frac{d\theta\:}{\theta\:^2\sqrt{13-\theta\:^2}}$

$\frac{dy}{dx}=x\cdot cos\left(5x\right)$

$9x-1=10x+9$

$\left(x+\left(y^{2\:}-xy\right)^{\frac{1}{2}}\right)\frac{dy}{dx}$

$-.8+4.2-66.23$