If sin A = cos A, find the value of
2 tan2 A - 2 sec2 A + 5.
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If sec (90° - 3A).cos 48° = 1 and 0 ≤ 3A ≤ 90°; find the value of angle A.
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If sec A sin A = 0, find the value of cos A.
Find angle A, if sec 2A = cosec (A + 48°).