Question

Find the value of x if cos2x = sin 60 cos 300 - cos 60 sin 30.

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Answer 1

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