1.(1-sint)(1+sint)=
2.sin50°/sin100°=
3.cos18°-sin18°/cos36°=
4.2sin165°cos165°=
5.[tex]cos^{2} 165 -sin^{2} 165[/tex]=
2.sin50°/sin100°=
3.cos18°-sin18°/cos36°=
4.2sin165°cos165°=
5.[tex]cos^{2} 165 -sin^{2} 165[/tex]=
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Answers & Comments
2) sin(5*пи/18)/sin(5*пи/9)
3) (cos(пи/10)*cos(пи/5)-sin(пи/10))/cos(пи/5)
4) не знаю
5) не знаю