$\left(2x\:-\:9\right)\:\left(2\:x\:+\:3\right)$
$6\le\:5-3y$
$z\left(x+1\right)^2$
$x+2=\frac{5}{x}$
$3\cot^2\left(x\right)+7\cot\left(x\right)-5=9$
$3x^2+5x\:-2=0$
$tan\:\left(45\:+\:a\right)=\frac{cos\:\left(a\right)+sen\left(a\right)}{cos\:\left(a\right)-sen\left(a\right)}$
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