已知sin(π/4-x)等于3/5,则sin2x等于?
3个回答
sin(π/4-x)=3/5
sin(2x)
=cos(π/2-2x)
=cos(2(π/4-x))
=1-2sin^2(π/4-x)
=1-2*(3/5)^2
=1-18/25
=7/25
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