$\tan\left(25\right)^2+1=\sec\left(25\right)^2$

$\frac{4}{\left(x+1\right)^2}=-2$

$\left(3x+10\right)\left(2x-15\right)$

$y^2+82y-10640$

$\frac{xdy}{dx+y}\:=\:e^x,y\left(1\right)=1$

$\left(3x^2e^y+e^x\cos\left(y\right)\right)dx+\left(x^3e^y-e^x\sin\left(y\right)\right)dy=0$

$1^1+2^2+3^3$