三角函数 一共八题.打钩的一共八题。打钩的。分不够了，都是计算题。
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三角函数 一共八题.打钩的一共八题。打钩的。分不够了，都是计算题。
三角函数 一共八题.打钩的
一共八题。打钩的。分不够了，都是计算题。
三角函数 一共八题.打钩的一共八题。打钩的。分不够了，都是计算题。
sin13π/6=sin(12π/6+π/6)=sinπ/6=1/2
cos13π/6=cosπ/6=√3/2
tan13π/6=tanπ/6=√3/3
sin(-5π/3)=-sin5π/3=-sin(-π/3+2π)=-sin(-π/3)=sinπ/3=√3/2
cos(-5π/3)=cos(5π/3)=cos(-π/3+2π)=cos(-π/3)=cosπ/3=1/2
tan(-5π/3)=tan(π/3-2π)=tanπ/3=√3
sin(-7π/3)=sin(-7π/3+2π)=sin(-π/3)=-sinπ/3=-√3/2
cos(-7π/3)=cos(-7π/3+2π)=cos(-π/3)=cosπ/3=1/2
tan(-7π/3)=tan(-7π/3+2π)=tan(-π/3)=-tanπ/3=-√3
sin(-25π/6)=sin(-25π/6+4π)=sin(-π/6)=-sin(π/6)=-1/2
cos(-25π/6)=cos(-25π/6+4π)=cos(-π/6)=cosπ/6=√3/2
tan(-25π/6)=tan(-25π/6+4π)=tan(-π/6)=-tanπ/6=-√3/3
sin(-17π/4)=sin(-π/4-4π)=sin(-π/4)=-sin(π/4)=-√2/2
cos(-17π/4)=cos(-π/4-4π)=cos(-π/4)=cosπ/4=√2/2
tan(-17π/4)=tan(-π/4-4π)=tan(-π/4)=-tan(π/4)=-1
sin(-7π/6)=-sin(7π/6)=-sin(π+π/6)=sinπ/6=1/2
cos(-7π/6)=cos(7π/6)=cos(π+π/6)=-cosπ/6=-√3/2
tan(-7π/6)=-tan(7π/6)=-tan(π+π/6)=-tanπ/6=-√3/3
sin(-5π/4)=-sin(5π/4)=-sin(π+π/4)=sinπ/4=√2/2
cos(-5π/4)=cos(5π/4)=cos(π+π/4)=-cosπ/4=-√2/2
tan(-5π/4)=-tan(5π/4)=-tan(π+π/4)=-tanπ/4=-1
sin(3π/4)=sin(π-π/4)=sinπ/4=√2/2
cos(3π/4)=cos(π-π/4)=-cosπ/4=-√2/2
tan(3π/4)=tan(π-π/4)=-tanπ/4=-1
sin(-5π/6)=-sin(5π/6)=-sin(π-π/6)=-sin(π/6)=-1/2
cos(-5π/6)=cos(5π/6)=cos(π-π/6)=-√3/2
tan(-5π/6)=-tan(5π/6)=-tan(π-π/6)=tanπ/6=√3/3.