$x^2-15x+13$

$-1+\frac{\left(5x+6\right)}{\left(x+2\right)^2}$

$3\ln\left(e\right)$

$3\left(5\right)+2\left(-2\right)^2$

$\left(0.5p+4q\right)^2$

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

$3\csc^2\left(x\right)=10\cot\left(x\right)$