$\frac{cos\left(x\right)-cos\left(y\right)}{sin\left(x\right)+sin\left(y\right)}+\frac{sin\left(x\right)-sin\left(y\right)}{cos\left(x\right)+cos\left(y\right)}=0$

$6\:\sin \theta+3=0$

$\left(x^2-3x-4\right)^2$

$\int x^{3^5}dx$

$\int\frac{2}{\left(x+2\right)^3}dx$

$\frac{\left(3x+1\right)^2-16}{3x-3}$

$5t-20t^2=0$