cos A=1/3 find cos 3A
blueboy04:
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BUT I WROTE THIS AND I SCORED FULL MARKS
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but I would like to go with ur method ..as it is short and mine is time consuming
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Answer :-
If CosA = 1/3
So, Cos3A = 1/3
CosA = 1/3 × 1/3
CosA = 3/3
CosA = 1
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