Prove by direct method that for any real number x,y if x = y then `x^(2) = y^(2)`.

Prove by direct method that for any real numbers x, y if x=y, then x^(2)=y^(2) .

Prove by direct method that for any real numbers x,y if x=y , then x^(2)=y^(2)

For any real number of x and y, if cos x=cos y then:

Let x= cos theta and y = sin theta for any real value theta . Then x^(2)+y^(2)=

Prove that for all real values of x and y ,x^2+2x y+3y^2-6x-2ygeq-11.

Prove that for all real values of x and y ,x^2+2x y+3y^2-6x-2ygeq-11.

Using direct method prove that if x, y in N and x,y are odd then xy is also odd.

Find the number of ordered pair of real numbers (x, y) satisfying the equation: 5x(1+1/(x^(2)+y^(2)))=12 & 5y(1-1/(x^(2) + y^(2))) =4

Prove that for all real values of xa n dy ,x^2+2x y+3y^2-6x-2ygeq-11.