$3\cdot15\cdot25$

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

$9r^2-4r+1$

$\left(3x^2+2\right)\sin\left(x\right)$

$5x^2+20x+12=0$

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

$2x+5<8$