Find x: cos3x =cos 60 degree cos 30 degree + sin 60 degree sin 30 degree
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So,
Cos 3x= cos60cos30+sin60sin30
Cos3x= cos(60-30) acc to cos(A-B)
3x = 60-30
3x= 30
X= 10
Cos 3x= cos60cos30+sin60sin30
Cos3x= cos(60-30) acc to cos(A-B)
3x = 60-30
3x= 30
X= 10
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