sin(-19π/6)=;sin(-16π/3)=;cos(-79π/6)=;tan(-26π/3)=;sin(15π/
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sin(-19π/6)=;sin(-16π/3)=;cos(-79π/6)=;tan(-26π/3)=;sin(15π/4)=;
cos(-60°)-sin(-210°)=?
cos(-60°)-sin(-210°)=?
![sin(-19π/6)=;sin(-16π/3)=;cos(-79π/6)=;tan(-26π/3)=;sin(15π/](/uploads/image/z/16571702-38-2.jpg?t=sin%EF%BC%88-19%CF%80%2F6%EF%BC%89%3D%EF%BC%9Bsin%EF%BC%88-16%CF%80%2F3%EF%BC%89%3D%EF%BC%9Bcos%EF%BC%88-79%CF%80%2F6%EF%BC%89%3D%EF%BC%9Btan%EF%BC%88-26%CF%80%2F3%EF%BC%89%3D%EF%BC%9Bsin%EF%BC%8815%CF%80%2F)
sin(-19π/6)=-sin(2pai+pai+pai/6)=1/2 sin(-16π/3)=-sin(4pai+pai+1/3pai)=根号3/2
cos(-79π/6)=cos(79pai/6)=cos(12pai+pai+pai/6)=-根号3/2 tan(-26π/3)=-tan(8pai+2pai/3)=-tan(pai-pai/3)=tan(pai/3)=根号3 sin(15π/4)=sin(4pai-pai/4)=-sin(pai/4)=-根号2/2
cos(-60°)-sin(-210°)=1/2+sin210=1/2-1/2=0
cos(-79π/6)=cos(79pai/6)=cos(12pai+pai+pai/6)=-根号3/2 tan(-26π/3)=-tan(8pai+2pai/3)=-tan(pai-pai/3)=tan(pai/3)=根号3 sin(15π/4)=sin(4pai-pai/4)=-sin(pai/4)=-根号2/2
cos(-60°)-sin(-210°)=1/2+sin210=1/2-1/2=0
sin(-21π/4) cos(-20π/3) tan(-19π/6)=
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