$3a^2+5a-a^2+10a+3+a$
$\frac{1-\sin\left(x\right)}{\cos\left(x\right)}-\frac{\cos\left(x\right)}{1-\sin\left(x\right)}$
$x^2+4x+4>0$
$3\left(2n+1\right)-\left(-6n-11\right)$
$\left(4x+6x\right)\left(4x+6x\right)$
$f\left(x\right)=\left(x^2-4x\right)^x\:\left(2x\right)^2$
$log\left(2x+1\right)+log\left(x+2\right)=0$
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