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If x = a cosΦ + b sinΦ and y = b cosΦ + a sinΦ, then find the value of x2 + y2 is ?
Solution
cos2Φ + sin2Φ = 1
x2 + y2 = (a cosΦ + b sinΦ)2 + (b cosΦ + a sinΦ)2
=...
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