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\cos θ + \sin θ = \sqrt{2}

θ = 2 n π + \frac{π}{4}

θ = 2 n π - \frac{π}{4}

θ = (2 n + 1) + \frac{π}{4}

θ = (2 n + 1) π - \frac{π}{4}

ANS : 1

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