[" 18.Using the formula,"cos A=sqrt((1+cos2A)/(2))" ,find the value of "cos3],[" 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, 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 cos^-1(-sqrt3/2)

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

Find the value of sqrt(1-cos^(2)A) .

Find the value of sqrt(1-cos^(2)A) .

Find the values of cos 22(1/2)^(@) using the value of cos 45°?