If `2cosAsinB = x`, then the value of x is

If x = 2, then the value of (x+5) (x+ 2) is

If sin(A+B)=sinAcosB+cosAsinB and cos(A-B)=cosAcosB+sinAsinB , find the values of (i) sin75^(@) and (ii) cos15^(@) .

If x(x-2)= 1 , then the value of x^(2) + (1)/(x^(2)) is .

If x + 1/x = 2 , then the value of x^2 + 1/(x^2) is :

If x+1/x=2 ,then the value of x^2+1/x^2 is :

Given that sin(A+B)=sinAcosB+cosAsinB , find the value of sin75^@ .