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If acos^3alpha+3acosalphasin^2alpha=m an...

If `acos^3alpha+3acosalphasin^2alpha=m` and `asin^3alpha+3acos^2alphasinalpha=n`. If `(m+n)^(2/3)+(m-n)^(2/3)=2lambdaa^(2/3)` then find the value of `lambda`

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