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OpenStudy (venesa):
whether cos2acos2b equal to 1?
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OpenStudy (anonymous):
\[(\cos ^{2}a -\sin ^{2}a)(\cos ^{2}b-\sin ^{2}b)\]....
OpenStudy (venesa):
whether it is equal to 1 ??
OpenStudy (anonymous):
simplfying from the step i gave you it will result to zero
OpenStudy (venesa):
ok
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