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Find the period of f(x)=|cos x|

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Solution:   We have ,     f(x)=left | cos x ight |

      \ \ Rightarrow hspace1cmf(x)=left | cos x ight |=sqrtcos^2x=sqrtfrac1+cos x2

  But  the function    cos 2x  has a period   T=pi ; hence the given function 

has same period.

Posted by

Deependra Verma

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