(根号下(1+2sin610°cos430°))/(sin250°+cos790°)的结果是?

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(根号下(1+2sin610°cos430°))/(sin250°+cos790°)的结果是?
(根号下(1+2sin610°cos430°))/(sin250°+cos790°)的结果是?

(根号下(1+2sin610°cos430°))/(sin250°+cos790°)的结果是?
(根号下(1+2sin610°cos430°))/(sin250°+cos790°)
=(√(1-2sin70cos70))/(sin70+cos70)
=(sin70-cos70)/(-sin70+cos70)
=-1.

(√(1+2sin610°cos430°))/(sin250°+cos790°)
=(√(1+2sin250°cos70°))/(sin250°+cos70°)
=(√(sin70°^2+cos70°^2-2sin70°cos70°))/(-sin70°+cos70°)
=(√(sin70°-cos70°)^2)/(-sin70°+cos70°)
=(sin70°-cos70°)/(-sin70°+cos70°)
= -1