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प्रश्न
If sec 4A = cosec (A− 20°), where 4A is an acute angle, find the value of A.
उत्तर
Given that,
sec 4A = cosec (A − 20°)
cosec (90° − 4A) = cosec (A − 20°)
90° − 4A= A− 20°
110° = 5A
A = 22°
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