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Mathematics 9 Online
OpenStudy (anonymous):

how to factor 1-cot^2x

OpenStudy (solomonzelman):

1-cot²x 1²-cot²x 1²-[cotx]² (1- cot x) (1 + cot x)

OpenStudy (jdoe0001):

\(\large a^2-b^2 = (a-b)(a+b)\)

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