Book Maths Puzzle Numerical Ability

if m=acos^3A+3acosAsin^2A and n=asin^3A+3asinAcos^2A then find the value of(m+n)^(2/3)+(m-n)^(2/3)

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Book Other Question

if sin A+sin^2 A=1, then find the value of cos^2 A+cos^4 A the value of 2sin^2 45+2cos^2 45+2sec^2 60 is