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If 2 cosθ = a + 1/a, then cos 3θ is equal to:
  • a)
  • b)
  • c)
  • d)
    none
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
If 2 cosθ= a + 1/a, then cos 3θ is equal to:a)b)c)d)noneCo...
First of all , use formula of cos3t (I am using 't'here as angle ) , then use values in that formula as given and then you have a cube formula so open that you will get your answer .
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If 2 cosθ= a + 1/a, then cos 3θ is equal to:a)b)c)d)noneCorrect answer is option 'A'. Can you explain this answer?
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