Các bạn giúp mình làm hết với ạ ^^

1)  cos x cos 3x - sin 2x sin 6x – sin 4x sin 6x=0

2)  sin 4x sin 5x + sin 4x sin 3x – sin 2x sin x=0

3)  cos x + cos 3x + 2cos 5x=0

4)  cos 22x + 3cos 18x + 3cos 14x + cos 10x=0

5)  sin 2x + sin 4x=sin 6x

6)  sin x + sin 2x=cos x + cos 2x

7)  2cos 5x cos 3x + sin x=cos 8x

8)  sin x + sin 3x + sin 5x=0

9)  cos 7x + sin 8x=cos 3x – sin 2x

10)cos 2x - cos 8x + cos 6x=1

11)2cos x cos 2x=1+ cos 2x + cos 3x

12)2sim x cos 2x + 1 + 2 cos 2x + sin x =0

13)3 cos x + cos 2x – cos 3x + 1=2sin x sin 2x

14) 1+2sin x cos x=sin x + 2cos x

15)sin x(sin x – cos x)-1=0

CÁC BẠN GIÚP MÌNH VỚI Ạ ^_^

1)\(\sin^2x+\sin^22x+\sin^23x=\frac{3}{2}\)

2)  \(\cos^2x+\cos^22x+\cos^23x=1\)

3)  \(\cos^2x+\cos^22x+\cos^23x+\cos^24x=2\)

4)  \(\sin2x=1+\sqrt{2}\cos x+\cos2x\)

5)  \(\sin x\left(1+\cos x\right)=1+\cos x+\cos^2x\)

6)  \(\left(2\sin x-1\right)\left(2\cos2x+\sin2x+1\right)=3-4\cos^2x\)

7)  \(\sin x+\sin2x+\sin3x=\sqrt{2}\left(\cos x+\cos2x+\cos3x\right)\)

8)  \(\cos5x\cos x=\cos4x\cos2x+3\cos^2x+1\)

9)  \(\sin7x+\cos^22x=\sin^22x+\sin x\)

10)   \(\sin2x+\left(1+2\cos3x\right)\sin x-2\sin^2\left(2x+\frac{\pi}{4}\right)=0\) 

11)  \(\sqrt{3}\cos5x-2\sin3x\cos2x-\sin x=0\)

12)  \(4\cos\frac{5x}{2}\cos\frac{3x}{2}+2\left(8\sin x-1\right)\cos x=5\)

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