x(-π/3,π/2)则y=cos(2x+π/4)值域

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x(-π/3,π/2)则y=cos(2x+π/4)值域
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x(-π/3,π/2)则y=cos(2x+π/4)值域
x(-π/3,π/2)则y=cos(2x+π/4)值域

x(-π/3,π/2)则y=cos(2x+π/4)值域
(-1,1)
cos(-5π/12,5π/4)包含cos(π/2,π)
则,值域为(-1,1)

x∈(-π/3,π/2)
则:
2x+π/4∈(-75°,225°)
则:cos(2x+π/4)∈(-1,1]