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296 cos(53 x) cos(42 x) cos(4x) dx = dx O 74 O 74 dx O 74 | (cos (cos(7x) + cos(15 x) + cos(91 x)
296 cos(53 x) cos(42 x) cos(4x) dx = dx O 74 O 74 dx O 74 | (cos (cos(7x) + cos(15 x) + cos(91 x) + cos(99 x)) 1 (cos(9 x) + cos(13 x) + cos(92 x) + cos(100 x)) dx 7a( (cos(7 x) + cos(13 x) + COS(88 x) + cos(99 x)) ) ) + cos 4 (cos(5 x) + cos(14 x) + cos(93 x) + cos(100 x)) dx (cos(8 x) + cos(16 x) + cos(90 x) + cos(98 x)) ( O 74 dx O 74
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