What is the value of sec 4π/3?
A) 2 B) -2 C) 2/√3 D) -2/√3
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Answer:
sec Ф = 1 / cos Ф
sec 4π/3 = 1 / cos 4π/3
= 1 / cos ( π + π/3 )
= 1/ (-1 / 2 )
= -2
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