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Question
If sec 4A = cosec (A – 10°) and 4A is acute then A = ?
Options
20°
25°
30°
40°
MCQ
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Solution
20°
Explanation:
sec 4A = cosec (A – 10°)
⇒ cosec (90° – 4A) = cosec (A – 10°)
⇒ 90° – 4A = A – 10°
⇒ 5A = 100°
⇒ A = 20°
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