Q.2473 : यदि sin 3A = cos (A - 10°) हो तो 3A एक न्यून कोण हो तो A = ?

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Q.2473 : यदि sin 3A = cos (A - 10°) हो तो 3A एक न्यून कोण हो तो A = ?
(a) 40°
(b) 25°
(c) 50°
(d) 30°

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Answer :25°