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If  x∈(−π,  π)  then find the number of solutions of the equation  21+|cosx|+∣∣cos2x∣∣+... = 4
  • a)
    4
  • b)
    3
  • c)

    2
  • d)
    0
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
If x∈(−π, π)then find the number of solutions of the ...
Given, 21+|cosx|+∣∣cos2x∣∣+∣∣cos3x∣∣+... = 22


Thus, total four solutions are possible for the given equation, they are 
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If x∈(−π, π)then find the number of solutions of the equation 21+|cosx|+cos2x+... = 4a)4b)3c)2d)0Correct answer is option 'A'. Can you explain this answer?
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