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$\sec^260+\csc^260$
$\left(5-x\right)^3$
$\left(-6mx-4ng\right)^2$
$\cos^2\left(u\right)-\sin^2\left(u\right)$
$2x^2+4x+3x+6$
$n^2+16n+63$
$100z^2+200yz+100y^2$
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