[toán11]chu kì

K

keythy

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X

xuanhungtg

doi voi ham so y=4sin2xb
voi moi so x thuoc R suy ra x(+-)(kpi)/b thuoc R
ta co : f(x+(kpi)/b)=4.2.b.(x+(kpi)/b)=8bx+8kpi=f(x)
=>ham so tren la ham tuan hoan
k thuoc Z nen chu ki tuan hoan la pi/b (khi k=1)
BAI SAU TUONG TU
 
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