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2x+3y3x+2y=56 হলে কোনটি xঃy ?
If x+y=a and x-y=b, then 2xy=
A real-valued function f satisfies the relation f(x)f(y) = f(2xy + 3) + 3f(x + y) - 3f(y) + 6y, for all real numbers x and y, then what will be the value of f(8)? 
If 22x + 1 × 32y - 30 × 2x ×  3y - 1 + 12 = 0 (x and y are non negative integers), then what is the value of 2xy/2x + y ?
Two boysM and N start from the same point. M walks 5 km south, then turns to his left and walks 6 km, then turns to his right and walks 5 km, and then again turns to his right and walks 6 km. At the same time, N walks 5 km north, then turns to his left and walks 6 km, then turns to his left and walks 10 km, and then again turns to his left and walks 3 km and then turns to his right and walks 5 km.What is the position of N with respect to M?
If 9 + 2 (3x – xy + x2) + y2 = 0, then what is the value of (3x2 – 2xy + 5y2)?
If X2 + Y2 + 4 + 2XY + 4X + 4Y = (6X / Y)2 then which of below mentioned relation holds true.
If x + 1/y = 2, then what is the value of {(x2y + 4xy + x)(2 – x)}/(2xy – x2y)?
f(z) = u(x, y) + iv(x, y) is an analytic function or complex variable z = x + iy where $${\text{i}} = \sqrt { - 1} ,$$   u(x, y) = 2xy, then v(x, y) may be expressed as
If x = b + c - 2a, y = c + a - 2b, z = a + b - 2c, then the value of x2 + y2 - z2 + 2xy is?