$5px-8;\:x=-2$
$\sqrt{5}0:\sqrt{2}-^5\sqrt{2}\:.^5\sqrt{1}6$
$36 + 12 n ^ { 2 } + n ^ { 4 }$
$\frac{\cos\left(90-x\right)\cos\left(x\right)}{\cot\left(x\right)}=1-\sin^2\left(x\right)$
$1+\cos^2a=\cos^2a\left(\sec^2a+1\right)$
$2\left(6m+3\right)+2\left(6m+3\right)$
$\sqrt{25}:\left(-8+3\right)$
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