$\left(-25\right)\cdot\left(-12\right)$
$\frac{1-4cos^2x}{1-2cosx}=1+2cosx$
$2\left(3f-5\right)-7\le13$
$x+8=3x+4$
$-\frac{5}{2}\cdot\frac{2}{5}$
$\frac{9a\sqrt{3}}{3}$
$\sin\left(4x\right)-\sin\left(2x\right)=0$
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