Question

find the value of x if cos 2x = cos 60*cos 30 + sin 60*sin30

Answer 1

cos2x=1/2*√3/2+√3/2*1/2
cos2x=√3/4+√3/4
cos2x=2√3/4
cos2x=√3/2
cos2x=cos30
2x=30
x=15


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