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 sin60^(@)cos30^(@)+sin30^(@)cos60^(@)

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

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

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

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

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

Using the formula tanA = (sin 2 A)/(1 + cos 2 A),"find the values of " tan75^(@) " and " cot 22^(@) 30