if acosx+bSINx=m,asinx-bcosx=n find a^2+b^2=m^2+n^2
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A.T.Q,
•a^2 + b^2 = m^2+n^2
•a^2+b^2 = (acosx)^2+(bsinx)^2+2ab(sinx)(cosx)
+(asinx)^2+(bcosx)^2-2ab(sinx)(cos)
•a^2+b^2 = a^2(cos^2x+sin^2x) + b^2(cos^2x+sin^2x)
•a^2+b^2 = a^2+b^2
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