Question

Can somebody please explain how to do this:)​

Answer 1

`\\ \sf\longmapsto (sin40.sin120)/(sin110-sin340)`

`\\ \sf\longmapsto (sin(90-50).sin(90+30))/(sin(90+20).sin(360-20))`

`\\ \sf\longmapsto (cos50.cos30)/(cos20.(-sin20)`

`\\ \sf\longmapsto (cos50cos30)/(-sin20cos20)`

`\\ \sf\longmapsto -(cos30cos50)/(sin20cos20)`