若sin(π/4+α)=m,求cos(π/4-α)的值
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若sin(π/4+α)=m,求cos(π/4-α)的值若sin(π/4+α)=m,求cos(π/4-α)的值若sin(π/4+α)=m,求cos(π/4-α)的值cos(π/4-α)=sin[π/2-
若sin(π/4+α)=m,求cos(π/4-α)的值
若sin(π/4+α)=m,求cos(π/4-α)的值
若sin(π/4+α)=m,求cos(π/4-α)的值
cos(π/4-α)
=sin[π/2-(π/4-α)]
=sin(π/4 +α)
=m
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