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Find the values of of the following: ...

Find the values of of the following:
i) `cos 135^(@)`
ii) `sin(-780^(@))`
iii) `"cosec" 1920^(@)`

Text Solution

Verified by Experts

i) `cos 135^(@)=cos(90^(@)+45^(@))`
`=-sin45^(@)=-1/(sqrt(2))` Ans.
ii) `sin(-780^(@))=-sin780^(@)`
`=sin(2xx 360^(@)+60^(@))`
`=tan60^(@)=sqrt(3)` Ans.
iv) `"cosec "1920^(@)=2/(sqrt(3))` Ans.
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