Question 5
sin x + sin 3x + sin 5x + sin 7x = 4 cos x cos 2x sin 4x 6. 6.6. 6.6. (sin 7 sin 5 ) (sin 9 sin 3 ) tan 6(cos 7 cos 5 ) (cos 9 cos 3 )
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SOLUTION
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sin x + sin 3x + sin 5x + sin 7x = 4 cos x cos 2x sin 4x 6. 6.6. 6.6. (sin 7 sin 5 ) (sin 9 sin 3 ) tan 6(cos 7 cos 5 ) (cos 9 cos 3 )
| x x x x xx | x | x | x |
|---|