Find the value of x if cos2x = sin 60 cos 300 - cos 60 sin 30.
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Answer:
x= 30
Step-by-step explanation:
Cos 2x= sin60 cos30 - cos 60 sin 30
= √3/2×√3/2 - 1/2×1/2
= 2/4-1/4= 1/2
cos 2x = 1/2
cos 2x = cos 60
2x= 60
x= 30
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