$\left(9a-2\right)\left(9a-2\right)$
$\csc\left(x\right)\left(\cos x+\sin x\right)=\cot\left(x\right)+1$
$3\:\sin u\:-\:\cos^2\:u\:-\:3\:=0$
$-8+7-5-1$
$z+2.4=19.7$
$\left(x^2-49x\right)\:\left(x+7\right)$
$\frac{2}{1}+\frac{1}{1}$
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