What is the period of the function f(x) = \(\rm \sin \left( {\frac{{x} – McqOptions

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1.	What is the period of the function f(x) = \(\rm \sin \left( {\frac{{x}}{4}} \right) + \cos \left( {\frac{{4x}}{5}} \right)\)?
A.	10π
B.	20π
C.	40π
D.	80π
Answer» D. 80π

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