$9+3b$

$\left(x-2\right)^2\le x\left(x-4\right)+8$

$\frac{cot^2t}{csc\:t}=\frac{1-sin^2t}{sin\:t}$

$\frac{24x^2y-36xy^2+60xy}{12xy}$

$\left(\sin^2x-\cos^2x\right)\left(1-2\sin2x\cdot\cos\left(2x\right)\right)$

$-7y+6-7+2+y-1$

$\cos\:\theta\:\left(\sec\:\theta\:-\cos\:\theta\:\right)$