作业帮sin13π/6+cos13π/3-tan(-23π/4)=
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sin13π/6+cos13π/3-tan(-23π/4)=
sin13π/6+cos13π/3-tan(-23π/4)=
sin13π/6+cos13π/3-tan(-23π/4)=
sin13π/6+cos13π/3-tan(-23π/4)
=sin(2π+π/6)+cos(4π+π/3)+tan(6π-π/4)
=sin(π/6)+cos(π/3)-tan(π/4)
=1/2+1/2-1
=0
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sin13π/6+cos13π/3-tan(-23π/4)=
COS13/6π
sin13π/6等于多少
求值sin(-23/6 π)+cos13/7 πtan4π-cos13/3π
计算：sin(-23π/6)+cos13π/7*tan4π-cos13π/3
计算sin43.cos13.-cos43.sin13.
sin13π/6的值是?
sin13度*sin13度+cos13度*cos13度=1么?
sin13π/6的三家函数值怎么算?
求值sin7π/3cos(-23π/6)+tan(-11π/4)cos13π/3
sin(-4π/3)= cos(-79π/6)= cos13π/6=
计算：cos13π/4+tan(-11π/6)=?
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sin13°cos17°+cos13°sin17°
sin13°cos77°+cos13°sin77°=
化简:sin43°-sin13°cos30°/cos13°
cos58度cos13度+sin17度sin13度
sin13度+cos377度+cos13度+sin197度的值