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[" 9.USing to UNMUIG SIDA "=sqrt((1-cos2...

[" 9.USing to UNMUIG SIDA "=sqrt((1-cos21)/(2))" ,bind "],[" the "40100" an sin "30" ; it being gillen "],[" that "cos60^(@)=(1)/(2)" ."]

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Using the formula, sinA=sqrt((1-cos2A)/(2)) , find the value of sin30^(@) , it being 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) .

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 2theta = 2 cos^(2)theta - 1 , find the value of cos 30^(@) , it is being given that cos 60^(@) = 1/2

Show that : sin 30^(@)=sqrt((1-cos60^(@))/(2))

Show that : sin 30^(@)=sqrt((1-cos60^(@))/(2))

Show that : cos30^(@)=sqrt((1+cos60^(@))/(2))

Show that : cos30^(@)=sqrt((1+cos60^(@))/(2))

Prove that cos 60^(@)=cos^(2)30^(@)-sin^(2)30^(@) .

(log)_(sin30^(@)cos60^(@))=1