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Question 4 - Solve cos x = 1/2 - Trigonometric Functions CBSE
Inverse Cos 1 and -1 : Special cases of the Inverse of Cosine Function
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Question 6 - Find general solution of cos 3x + cos x - cos 2x = 0
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Example 29 - Prove cos2 x + cos2 (x + pi/3) + cos2 (x - pi/3)