已知关于X的函数f(x)=√2sin(2x+φ)(-π
问题描述:
已知关于X的函数f(x)=√2sin(2x+φ)(-π
数学人气:980 ℃时间:2020-06-03 01:45:32
优质解答
偶函数
fx=f-x
so
fx=√2sin(2x+φ)=f-x=√2sin(-2x+φ)=-√2sin(2x-φ)=√2sin(2x-φ+pai)
pai-φ=2kπ+φ
φ=kπ+π/2
k=-1
φ=-π/2
fx=√2sin(2x-π/2)=-√2cos2x>=1
COS2X2X属于(2kπ+3π/4,2kπ+5π/4)
X属于(kπ+3π/8,kπ+5π/8)
fx=f-x
so
fx=√2sin(2x+φ)=f-x=√2sin(-2x+φ)=-√2sin(2x-φ)=√2sin(2x-φ+pai)
pai-φ=2kπ+φ
φ=kπ+π/2
k=-1
φ=-π/2
fx=√2sin(2x-π/2)=-√2cos2x>=1
COS2X2X属于(2kπ+3π/4,2kπ+5π/4)
X属于(kπ+3π/8,kπ+5π/8)
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答
偶函数
fx=f-x
so
fx=√2sin(2x+φ)=f-x=√2sin(-2x+φ)=-√2sin(2x-φ)=√2sin(2x-φ+pai)
pai-φ=2kπ+φ
φ=kπ+π/2
k=-1
φ=-π/2
fx=√2sin(2x-π/2)=-√2cos2x>=1
COS2X2X属于(2kπ+3π/4,2kπ+5π/4)
X属于(kπ+3π/8,kπ+5π/8)