1 ..Cos 7x -✓3 sin 7x =✓5 cos x + sin x
2.. ✓3 sin 4 x – sin 5x = cos 4 x + cos 5 x
1 ..Cos 7x -✓3 sin 7x =✓5 cos x + sin x 2.. ✓3 sin 4 x – sin 5x = cos 4 x + cos 5 x
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1 ..Cos 7x -✓3 sin 7x =✓5 cos x + sin x
2.. ✓3 sin 4 x – sin 5x = cos 4 x + cos 5 x