$x^2-3x+15$

$\int\sqrt{1+\tan^2\left(\frac{3x}{4}\right)}dx$

$\int_0^{10}xe^xdx$

$2\ln\left(x\right)-\ln\left(2x-9\right)=\ln\left(7x\right)-\ln\left(x-2\right)$

$\left(12y^2+12\right)dx+8xydy=0$

$\sec\left(a\right)\cdot\tan\left(a\right)\cdot\csc\left(a\right)=\frac{1}{\cos^2\left(a\right)}$

$\int\left(2-\sqrt{tanx}\right)^2sec\:^2xdx$