$$\lim_{x\to\frac{3\pi}{2}}\left(\frac{1+2sin\left(x\right)\left(cosx\right)}{\left(1+sinx\right)\left(1-2sinx\right)}\right)$$

$$\int5tan\:x\:sec^2dx$$

$$18\::\:-9$$

$$-6\left(+4\right)-5$$

$$1\:+\frac{1}{2}\left(\cos\left(20\right)+\cos\left(120\right)\right)+\frac{1}{2}\left(\cos\left(20\right)-\cos\left(120\right)\right)$$

$$4x<3$$

$$4i^2-5i-2$$