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Example 26 - Prove cos 2x cos x/2 - cos 3x cos 9x/2 = sin 5x
Ex 3.4, 6 - Find general solution of cos 3x + cos x - cos 2x = 0
Example 29 - Prove cos2 x + cos2 (x + pi/3) + cos2 (x - pi/3)
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Ex 3.4, 6 - Find general solution of cos 3x + cos x - cos 2x = 0 - Ex
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Ex 7.3, 13 - Integrate cos 2x - cos 2a / cos x - cos a - Ex 7.3
Example 29 - Prove cos2 x + cos2 (x + pi/3) + cos2 (x - pi/3)
Example 15 - Prove cos (pi/4 + x) + cos (pi/4 - x) = root 2 cos x
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