求下列值域(1)y=sinX/2,X属于R(2)y=3sin(2X+π/4),X属于{-π/8,没分了但定采纳!
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求下列值域(1)y=sinX/2,X属于R(2)y=3sin(2X+π/4),X属于{-π/8,没分了但定采纳!
求下列值域(1)y=sinX/2,X属于R(2)y=3sin(2X+π/4),X属于{-π/8,没分了但定采纳!
求下列值域(1)y=sinX/2,X属于R(2)y=3sin(2X+π/4),X属于{-π/8,没分了但定采纳!
(1)-1≤sinx≤1
所以值域为[-1/2,1/2]
(2)x∈[-π/8,π/4]
所以2x+π/4∈[0,3π/4]
所以sin(2x+π/4)∈[0,1]
值域为[0,3]