$6\sin\left(a\right)+4=2sin\left(a\right)+8$
$225t^2-1$
$\frac{\left(2e^{2x}\right)}{5x-20}$
$-csc\frac{x}{2}.cotg\frac{x}{2\:}$
$sin\left(45\right)=\frac{30}{26+x}$
$-4+\left(-3+6\right)-\left(4-8\right)$
$\left(4b\right)^2$
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