If a = 3 , find the value of `a^2`

If x=1, y=2 and z=3 , find the value of x^(2)+y^(2)+2xyz .

If ( x - 1 )/x = 3 , find the value of ( x^2 + 1 )/x^2

If x - 1/x = 3 , find the value of x^2 + 1/x^2

If x + 1/x = 3 , find the value of x^2 + 1/x^2

If a + 1/a = 3 , find the value of ( a - 1/a )^2

If x/y = 3/2 , find the value of ( x^2 + y^2 ) /( x^2 - y^2 )

If six x = 1/3 , find the value of cot^(2)x .

If x=1, y=2 and x=3, find the value of 4x^(2)yz

If the point C(3,7) divides internally the line segment joining the points A(4,8) and B(a,b) in the ratio 1:3 , find the value of |a^(2)-b^(2)| .