$\frac{csc\:t\:+1}{cot\:t}=\frac{cot\:t}{csc\:t-1}$

$2\sec^2\left(\theta\right)+\tan\left(\theta\right)-3=0$

$2^3-7$

$\left(x^m+x^n\right)^2$

$\lim\:_{h\to\:0}\:\:\frac{x^2\:+\:3xh^2+h^3}{2xh+5h^2}$

$-x^2+2x->0$

$\frac{\left(cos\left(x\right)-1\right)}{sin\left(x\right)}+\frac{sin\left(x\right)}{cos\left(x\right)+1}$