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if acos3x+ 3a sin2x*cosx=m and asin3x+ 3a sinx * cos2x =n. prove that(m+n)^2/3 + (m-n)^2/3= 2a^2/3

if acos3x+ 3a sin2x*cosx=m and asin3x+ 3a sinx * cos2x =n. prove that(m+n)^2/3 + (m-n)^2/3= 2a^2/3

Grade:10

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