$5\cdot\:3\cdot\:\left(-6\right)\cdot\:\left(-7\right)$

$\lim_{x\to+\infty}\left[\frac{1+\tan\left(x\right)}{1+sen\left(x\right)}\right]^{\frac{1}{sen\left(x\right)}}$

$\lim_{x\to\frac{-\pi}{4}}\frac{\left(\tan\left(x\right)+1\right)}{4x+\pi}$

$\int\left(\sin\left(t\right)^2\right)dt$

$4\sin\left(x\right)+2=-0.35$

$-5a^2b^3\left(3a^2\right)$

$x^2-3x+9\:x-2$