$\int\frac{14}{x^2+13x+30}dx$

$\frac{\cos\:\left(x\right)+\sin\:\left(x\right)}{\cos\:\left(x\right)\sin\:\left(x\right)}=\frac{1+\tan\:\left(x\right)}{\sin\:\left(x\right)}$

$625x^2+300xy+36y^2$

$2\:\ln\left(x\right)-\ln\left(5\right)=\ln\left(x+10\right)$

$3\sec^2x=5\left(1+\tan x\right)$

$t^2-4t-12$

$\left(b+9\right)\left(-b+8\right)$