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4 (\sin^{2} θ + \cos θ) = 5

সমীকরণের সাধারণ সমাধান -

θ = 2 n π \pm π / 2

θ = 2 nπ \pm π / 3

θ = 2 nπ \pm π / 4

θ = 2 nπ \pm π / 5

ANS : 2

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