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求Cos三分之二十二π的三角函数值

cos22π/3 =cos(18π/3+4π/3) =cos(6π+4π/3) =cos(4π/3) =cos(π+π/3) =-cosπ/3 =-1/2.

三角函数有多种,常用的是正弦、余弦、正切和余切,分别如下: sin(-29π/5)=sin(-6π+π/5)=sin(π/5)=0.58778525229247312916870595463907……; cos(-29π/5)=cos(-6π+π/5)=cos(π/5)=0.80901699437494742410229341718282……; tan(-29π/5)=tan(-6π+π/...

用计算机算吧,sin20°=0.34202,cos20°=0.93969,tan20°=0.36397

解: sin(-26°):- cos(-26°):+ tan(-26°):- cot(-26°):- sec(-26°):+ csc(-26°):-

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