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Question -

If sin 3A = cos (A – 26°), where 3A is an acute angle, And the value of A.



Answer -

sin 3A = cos (A – 26°)
⇒ cos (90° – 3A) = cos (A – 26°)
Comparing,
90° – 3A = A – 26°
⇒ 90° + 26° = A + 3A ⇒ 4A = 116°

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