12. If acoso + 3acos@siro = m
asine3thets + 3acos2theta ensinetheta=n
then( m + n)2/3 + (m - n)2/3 =?
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if a cos3 theta+3 sin2theta costheta =m and a sin3theta+ 3a sintheta cos2theta = n , then prove that (m+n)2/3 + (m-n )2/3 ...
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