$\sin=0.875$

$sin\left(\frac{\pi}{2}-o\right)=cos\left(o\right)$

$-3.5m^3n^2-2.5m^3n^2$

$\left(\frac{1}{2}+a\right)\left(\frac{1}{2}-a\right)$

$\lim_{x\to\infty}\left(\frac{3^x}{xe^x}\right)$

$\sqrt{4+x^2}^4$

$3\sin\left(x\right)\tan\left(5x\right)-3\tan\left(5x\right)=0$