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sin120^(@)=sin(180^(@)-60^(@))=sin60^(@)...

`sin120^(@)=sin(180^(@)-60^(@))=sin60^(@)=(sqrt(3))/(2)`
`cos150^(@)=cos(180^(@)-30^(@))=-cos30^(@)=(-sqrt(3))/(2)`
`tan172^(@)=tan(180^(@)-8^(@))=-tan8^(@)=-0.1405`

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