$\left(2.2\right)\left(2.2-5\right)$

$12+5+-9+2+-6$

$x^2+11+28$

$-12+6\cdot\left(-3\right)+\left(-5\right)$

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

$s+0.21s-0.15s$

$2\sqrt{-32}$