$$\csc u-\cot u$$

$$\lim_{x\to10}\left(\frac{100}{\left(x-10\right)^2}\right)$$

$$\:\left(a+b+c\right)+\left(2a+2b-c\right)$$

$$3+4+5^2$$

$$\left(6x^7-5y\right)^5$$

$$\left(\frac{4my^2}{3g^3}+2\frac{2x^2}{5}\right)$$