$\left(1+\sec\left(x\right)^2\right)\sin\left(x\right)^2$

$24\:+\:80\:-\:80\:-\:15\:+\:35$

$\frac{\left(x^5+x-1\right)}{2x^4+6x^2+4}$

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

$cos^2xsinx+sinx=0$

$3rn^{-5}\cdot6r^{-3}n^4$

$\left(-10\right)-\left(-7\right)+12$