Q.2450 : यदि a cos θ + b sin θ = 8 तथा a sin θ - b cos θ = 5 हो तो (a² + b²) = ?

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Q.2450 : यदि a cos θ + b sin θ = 8 तथा a sin θ - b cos θ = 5 हो तो (a² + b²) = ?
(a) 13
(b) 40
(c) 89
(d) 39

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Answer :89