$\int\left(-tan\left(x\right)ln\left(6cos\left(x\right)\right)\right)dx$

$\int e^{5x}\cos\left(3x\right)dx$

$\:\frac{\left(2t+1\right)}{2\left(t^2+t\right)}$

$\frac{dy}{dx}+5y=e^{5x}$

$\cos=-\frac{3}{\sqrt{13}}$

$\left(x^4-x^3+2x^2-x+3\right)entre\:x-1$

$8+\left\{-5-\left\{2+9\right\}\right\}-4+7$