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In each case given below, find the value of angle A, where 0° ≤ A ≤ 90°.
(i) sin (90° - 3A). cosec 42° = 1
(ii) cos (90° - A). sec 77° = 1
Evaluate :
sin2 34° + sin2 56° + 2 tan 18° tan 72° - cot2 30°