$4sin^2x-4sin^4x=sin^2\left(2x\right)$
$v^2-9v+81$
$\sec\left(x\right)^2+\csc\left(x\right)^2=\sec\:\left(x\right)^2+\csc\:\left(x\right)$
$20-2.10-3.\left(6-9\right)$
$-6+\sqrt[2]{36}$
$x^2-\frac{2}{3}x$
$8+\left(5-4+1\right)-\left(7+3-5\right)$
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