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If sec (90° - 3A).cos 48° = 1 and 0 ≤ 3A ≤ 90°; find the value of angle A.
In △ABC, angle C is 90° then find the value of sin (A + B).
If sec A sin A = 0, find the value of cos A.
Find angle A, if sec 2A = cosec (A + 48°).