For each positive or negative value of x and y except zero the value of `x^2 + y^2` is always positive, Explain.

For all positive values of x and y the value of ((1+x+x^(2))(1+y+y^(2)))/(xy) is-

If x is real, find the real values of p which make 4x^2+px+1 always positive.

In which direction the value of d_(x^(2)-y^(2)) is zero?

Is mass defect always positive or negative ?

If x be real then prove that (x-1)(x-2)+1 is always positive.

If cos x + cos y = 2, "then the value of" sin(x + y) is-

Write the converse of each of the following conditional statements : If x and y are two integers such that (x -y) is always a positive integer , then xgty .

IF x is real , find the real values of a which make x^2-ax+1-2a^2 always positive.

If set of values a for which f(x)=a x^2-(3+2a)x+6, a!=0 is positive for exactly three distinct negative integral values of x is (c , d] , then the value of (c^2 + 4|d|) is equal to ________.

Electron-gain enthalpy value of Cu is negative while that of Zn is positive explain?