If ????????????4????=cos(????−20°), where 4a is an acute angle, find the value of
a.
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given,
???????????4???? = cos(????-20)
4a is acute then it must be less than 60
now, 4a=60a
a =60/4
a=15
???????????4???? = cos(????-20)
4a is acute then it must be less than 60
now, 4a=60a
a =60/4
a=15
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