函数y=cos(x+π/2),x∈[π/4,5π/4]的值域为
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函数y=cos(x+π/2),x∈[π/4,5π/4]的值域为
函数y=cos(x+π/2),x∈[π/4,5π/4]的值域为
函数y=cos(x+π/2),x∈[π/4,5π/4]的值域为
x∈[π/4,5π/4]
x+π/2∈[3π/4,7π/4]
y=cos(x+π/2)∈[-1,根号2/2]
值域为[-1,根号2/2]
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值域为[-1,四分之五派]
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