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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 (180^(@) + 30 ^(@))= tan 30^(@)= (1)/(sqrt3)`
(iii) `sin300^(@) = sin (270^(@) + 30^(@)) = -cos 30^(@) = - (sqrt3)/(2)`
(iv) `cos 120^(@) = cos (180^(@) - 60^(@))= - cos 60^(@) = - (1)/(2)`
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