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NDA 2017 Mathematics question

MathematicsTrigonometric Ratio and IdentitiesNDA 2017

is true if

Answer: (C)

Solution

, so the relation holds when $Missing argument for \dfrac\dfrac A2+Missing argument for \dfrac\dfrac A2 = Missing argument for \sqrt\sqrt2(Missing argument for \dfrac\dfrac

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Question ID VK-028729