if a cos^3 theta + 3 a sin^2 theta cos theta = m and a sin^3 theta + 3 a cos ^2 theta = nprove that (m+n)^2/3 + (m - n)^ 2/3 = 2a ^ 2/3
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Start with or is it ?? make the relevant substitutions for m and n from above then expand and simplify until you get the RHS
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