f(x)=5根号下3cos^2x+根号下3sin^2x-4sinxcosx x属于[π/4,7π/24](1)求f(X)
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f(x)=5根号下3cos^2x+根号下3sin^2x-4sinxcosx x属于[π/4,7π/24](1)求f(X)的值域 (2)求单减区间
f(x)=5根号下3cos^2x+根号下3sin^2x-4sinxcosx x属于[π/4,7π/24]
f(x)=根号3(5(1+cos2x)/2)+根号3(1-cos2x)/2-2sin2x
f(x)=5(根号3)/2+5(根号3)cos2x/2+根号3/2-(根号3)cos2x/2-2sin2x
f(x)=3(根号3)+2(根号3)cos2x-2sin2x
f(x)=2[(根号3)^2+(-1)^2]^(1/2) * sin(2x+arctan(-根号3))+3(根号3)
f(x)=4sin(2x-π/3)+3(根号3)
值域:[-4+3根号3, 4+3根号3]
2x-π/3E[2kπ-π/2,2kπ+π/2]时,增的
即:2xE[2kπ-π/6,2kπ+5π/6]
即:xE[kπ-π/12,kπ+5π/12]时,是增的.
当2x-π/3E[2kπ+π/2,2kπ+3π/2]时,是减的即:2xE[2kπ+5π/6,2kπ+11π/6]
即:xE[kπ+5π/12, kπ+11π/12]时,是减的.
楼上的错了!2根号3cos2x-2sin2x=4sin(2x-pai/3)不是4sin(2x-pai/6)
f(x)=根号3(5(1+cos2x)/2)+根号3(1-cos2x)/2-2sin2x
f(x)=5(根号3)/2+5(根号3)cos2x/2+根号3/2-(根号3)cos2x/2-2sin2x
f(x)=3(根号3)+2(根号3)cos2x-2sin2x
f(x)=2[(根号3)^2+(-1)^2]^(1/2) * sin(2x+arctan(-根号3))+3(根号3)
f(x)=4sin(2x-π/3)+3(根号3)
值域:[-4+3根号3, 4+3根号3]
2x-π/3E[2kπ-π/2,2kπ+π/2]时,增的
即:2xE[2kπ-π/6,2kπ+5π/6]
即:xE[kπ-π/12,kπ+5π/12]时,是增的.
当2x-π/3E[2kπ+π/2,2kπ+3π/2]时,是减的即:2xE[2kπ+5π/6,2kπ+11π/6]
即:xE[kπ+5π/12, kπ+11π/12]时,是减的.
楼上的错了!2根号3cos2x-2sin2x=4sin(2x-pai/3)不是4sin(2x-pai/6)
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