[" the formula,"cos A=sqrt((1+cos2A)/(2))" ,find the value of "cos30^(@)" ,it "],[" 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, sinA=sqrt((1-cos2A)/(2)) , find the value of sin30^(@) , it being 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

If cos A = sqrt((sqrt(2)+1)/(2sqrt(2))) , find the value of cos2A

Find the value of cos60^(@) cos 30^(@)-sin 60^(@) sin 30^(@)

Given cos 45^@=1/sqrt2 , find the value of cos 22 1^@/2 .

find the value of sin60^(@)cos30^(@)+sin30^(@)cos60^(@)

Find the value of sin60^(@)cos30^(@)+cos60^(@)sin30^(@) .