sin(-π/6)+cos11π/3+tan(-5π/6)=急
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sin(-π/6)+cos11π/3+tan(-5π/6)=急
sin(-π/6)+cos11π/3+tan(-5π/6)=
急
sin(-π/6)+cos11π/3+tan(-5π/6)=急
sin(-π/6)+cos11π/3+tan(-5π/6)
=-sin(π/6)+cos2π/3+tanπ/6
=-1/2-1/2+√3/3
=√3/3-1
sin(-π/6)+cos11π/3+tan(-5π/6)=急
sin4/3π*cos11/6π*tan3/4π=
(sin2π/3+cos11π/6)tan7π/4=
3(cos11π/6+isin11π/6) 解复数三角形
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