作业帮f(x)=2sinx(sinx+cosx),x∈[-π/2,π/2]时,求f(x)的值域
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/01 19:41:54
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f(x)=2sinx(sinx+cosx),x∈[-π/2,π/2]时,求f(x)的值域
f(x)=2sinx(sinx+cosx),x∈[-π/2,π/2]时,求f(x)的值域
f(x)=2sinx(sinx+cosx),x∈[-π/2,π/2]时,求f(x)的值域
f(x)=2sin^2x+2sinxcosx
=1-cos2x+sin2x
=√2sin(2x-45°）+1
x∈[-π/2,π/2]
2x∈[-π,π]
2x-45∈[-5π/4,3π/4]
sin(2x-45)∈[-1,1]
f(x)∈[1-√2,1+√2]