$t^2+19t-20<0$
$\left(3.2m^{2z+1}+m^{z+2}\right)^2$
$\frac { ( 1 + x ) ^ { 2 } - 1 } { x }$
$4\left(x+2\right)-3\left(x-546\right)$
$\frac{2sen300+2cos600}{2tan450}$
$3x-15\le\:45-2x$
$0.5\sin^{2}x=4-2\cos^{2}x$
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