$\frac{9^2}{4}-ab+b^2$

$s\frac{-\left(1+s\right)}{s}+\frac{1}{s^2+1}$

$\int\left(\frac{9+cos^3\left(x\right)}{cos^2\left(x\right)}\right)dx$

$2\sin^2\left(y\right)-7\sin\left(y\right)=-3$

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

$-151\ge-45-a$

$-20\left(9\right)\left(-3\right)\left(-4\right)$