$5\:x\:6.2$

$y=ln\sqrt{\frac{1+sen\:t}{cos\:t}}$

$\sqrt{16-\left(r\cdot\cos\left(x\right)\right)^2-\left(r\cdot\:\sin\left(x\right)\right)^2}$

$\int\ln\left(4\right)\left(x\right)dx$

$\int x^7\left(x^8-6\right)^4dx$

$sen2x\cdot cot2x+sen2x=1$

$\frac{4a^4b^{-3}}{ba^{-3}}$