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Find the value of cos(-60^(@))...

Find the value of
`cos(-60^(@))`

Text Solution

Verified by Experts

(i) `cos (-60^(@))= cos 60^(@)=(1)/(2)`
`(ii) tan 210^(@)= tan(108^(@)+30^(@))= tan 30^(@)=(1)/(sqrt(3))`
`(ii) sin 300^(@)=sin (270^(@)+30^(@))=- cos(30^(@))=-(sqrt(3))/(2)`
`(iv) cos 120^(@)=cos (180^(@)-60^(@))= - cos 60^(@)= -(1)/(2)`
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