sin^2 (π/12) -(1/2)=
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sin^2 (π/12) -(1/2)=
sin^2 (π/12) -(1/2)=
sin^2 (π/12) -(1/2)=
(1/2)^2-1/2=-(1/2)
sin^2 (π/12) -(1/2)=
sin^ 2 π/12-1/3=?
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为什么sin-sin^2=1/4
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求sin²π/12-1/2