Find the values of :
sec 30° tan 60° + sin 45° cosec 45° + cos 30° cot 60°
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sin2 60° - cos2 45° + 3 tan2 30°
Taking A = 30°, verify that
(i) cos4 A - sin4 A = cos 2A
(ii) 4 cos A cos (60° - A) cos (60° + A) = cos 3A.