$2\sin\left(x\right)\cos\left(x\right)+2\sin\left(2x\right)$
$\cot^2\left(a\right)-\cot^2\left(a\right)\cos^2\left(a\right)$
$n+2=-14-n$
$25-\left(-2\right)$
$x^2+3x+6>-2x+2$
$\left(x^2+7x+6\right)\left(x^2+2x+5\right)$
$10-\left(4\:.\:10\right)+4$
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