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If tanA=n tanB and sinA=m sinB, prove that cos^2A=m^2-1/n^2-1

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asked Feb 5, 2018 in Mathematics by Kundan kumar (49,132 points) ● 34 ● 440 ● 1390

If tanA=n tanB and sinA=m sinB, prove that cos2A=m2-1/n2-1

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answered Feb 5, 2018 by Vikash Kumar (144,729 points) ● 8 ● 11 ● 26
 
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We have to find cos2 A in terms of m and  n. This means that the angle B is to be eliminated from the given relations.

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