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" I.Using the formula,"cos A=sqrt((1+cos...

" I.Using the formula,"cos A=sqrt((1+cos2A)/(2))" ,find the value of cos "30^(@)" ; given that "

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Using the formula cos A =sqrt((1+cos2A)/(2)) , find the value of cos30^(@) , it is given that cos60^(@)=(1)/(2) .

Using the formula cos A =sqrt((1+cos2A)/(2)) , find the value of cos30^(@) , it is given that cos60^(@)=(1)/(2) .

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