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

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/20 07:43:48
(根号下(1+2sin610°cos430°))/(sin250°+cos790°)的结果是?
x){قO? djgڐ_lb "}$P( 2H=|g<&H& FW J>ү onRaթk2ЄB5t1U$An@,ҠșP`5`+qjƢC` ⌠^b.Ta8#"bjëCAA),xeo

(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