已知sin(π/4+x)=1/3,则sin2x等于
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已知sin(π/4+x)=1/3,则sin2x等于已知sin(π/4+x)=1/3,则sin2x等于已知sin(π/4+x)=1/3,则sin2x等于sin(π/4+x)=-3/5sinxcosπ/4
已知sin(π/4+x)=1/3,则sin2x等于
已知sin(π/4+x)=1/3,则sin2x等于
已知sin(π/4+x)=1/3,则sin2x等于
sin(π/4+x)=-3/5
sinxcosπ/4+cosxsinπ/4=-3/5
√2/2(sinx+cosx)=-3/5
sinx+cosx = -3√2/5
(sinx+cosx)^2 = (-3√2/5)^2
sin^2x+cos^2x+2sinxcosx=18/25
1+sin2x=18/25
sin2x = -7/25
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