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(sin A + cos A)(sec A + cosec A) = 2 + sec A cosec A
(tan A + cot A)(cosec A - sin A)(sec A - cos A) = 1
If 4 cos2 A - 3 = 0 and 0° ≤ A ≤ 90°; then prove that :
(i) sin 3A = 3 sin A - 4 sin3 A
(ii) cos 3A = 4 cos3 A - 3 cos A