Q.2439 : यदि tan A = 3/4 हो तो (cos² A - sin² A) = ?

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Q.2439 : यदि tan A = 3/4 हो तो (cos² A - sin² A) = ?
(a) 1/4
(b) 1/2
(c) 4/25
(d) 7/25

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Answer :7/25

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