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QUESTION
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If Tan A = n Tan B and Sin A = m Sin B then Cos2 A is
Solution
Let us Assume, A = B = 45°
Then Cos2 45° = (1/√2)2 = 1/2
Tan 45° = n...
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Solution
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Cos 45° = 1/√2
Solve using substitution method
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