Q.2449 : यदि (cos x + sin x ) = √2 cos x हो तो (cos x

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Q.2449 : यदि (cos x + sin x ) = √2 cos x हो तो (cos x - sin x) = ?
(a) -√2 cos x
(b) √2 sin x
(c) 1/√2 sec x
(d) 1/√2 cosec x

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Answer :√2 sin x