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Find the approximate values of : cos(8...

Find the approximate values of :
`cos(89^(@)30)," given "1^(@)=0.0175^( c )`.

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Verified by Experts

`cos(89^(@)30')=?`
`30'=((30)/(60))^(@)`
`=((1)/(2))^(@)`
`(89(1)/(2))^(0)=((179)/(2))^(@)` ltbr. `cos(89^(@)30')=cos((179)/(2))^(@)`
`=cos((179)/(2))^(@)`
`1^(@)=0*0175^(@)C` [Given]
`cos(89^(@)30')=(179)/(2)xx0*0175`
`=1*56625^(@)C`
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