$\log\left(2x-5\right)+\log\left(2x+5\right)=2\log\left(x\right)+\log\left(3\right)$
$\left(3\right)\left(-4\right)\left(-25\right)$
$\tan^2x\cos^2+\cos x=1$
$\left[-20\right]\cdot0$
$\left(2x+3y-5\right)dx+\left(3x-y-2\right)dy=0$
$2a-3a+a-6a$
$\left(\sec-\tan\right)\left(\sec+\tan\right)=1$
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