$\left(\frac{1}{\infty}e^{\infty}-e^{\infty}+\frac{1}{\infty}\right)-\left(\frac{1}{1}e-e+\frac{1}{1}\right)$
$\left(3a+5\right)\left(3a-2\right)$
$\frac{\left(1+\:sen\:x\:+\:cos\:x\right)^2}{\left(tg\:x\:+\:senx\right)\left(cotg\:x\:+cos\:x\right)}$
$\left(2-3-1\right)$
$0.56+2.02$
$6x^2-x-3$
$x^2+20x-18=3$
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