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प्रश्न
Find the value of 'A', if (2 - cosec 2A) cos 3A = 0
उत्तर
(2 - cosec 2A) cos 3A = 0
⇒ 2 - cosec 2A = 0 and cos 3A = 0
⇒ cosec 2A = 2 and cos 3A = 0
⇒ cosec 2A = cosec 30° and cos 3A = cos 90°
⇒ 2A = 30° and 3A = 90°
⇒ A = 15° and A = 30°.
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