Cos 3x + cos x + cos 2x = 0
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Answered by
0
Step-by-step explanation:
hope it will be helpful
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Answered by
1
X=18°
Step-by-step explanation:
Cos3X+cosX+cos2X= 0
Cos5X=0
Cos90°=0
Cos5X=cos90°
5X=90°
X=18°
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