$\left(4x^2+1^2\right)$
$2cos2x=sin2xcotx-2sin^2x$
$\left(2-3\right)+\left(32-81\right)$
$5^2\cdot5^2$
$30:\left(15-5\right)-\left[8-\left(2+7-12\right)+6\right]$
$\frac{sin\left(3\theta\:\right)+sin\theta\:}{cos\theta\:-cos\left(3\theta\:\right)}$
$-4x^2+8x-4$
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