Q.
The period of the function f(x)=[8x+7]+∣tan2πx+cot2πx∣−8x (where [.] denotes the greatest integer function), is _______.
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answer is 0.25.
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Detailed Solution
f(x)=[8x+7]+|tan2πx+cot2πx|−8x=[8x]−8x−7+|tan2πx+cot2πx|=−{8x}+|tan2πx+cot2πx|+7Period is {8x} is 1/8. Also, |tan2πx+cot2πx|=sin2πxcos2πx+cos2πxsin2πx=1sin2πxcos2πx=|2cosec4πx|Now, period of 2 cosec 4πx is 1/2. Then period of |2cosec4πx| is 1/4.Therefore, period is L.C.M. of 18 and 14 which is 14.
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