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 Which is the value of 3x2y — 5xy3 when x = —2 and 2 y=-3?
x=15, y=5 হলে x3-3x2y+3xy2-y3=?
Find the value of divergence theorem for the field D = 2xy i + x2 j for the rectangular parallelepiped given by x = 0 and 1, y = 0 and 2, z = 0 and 3.
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 ?
If f(x + y) = x2 + √y + 2xy, y is a perfect square and y > x, than what is the value of f(13)?
If 9 + 2 (3x – xy + x2) + y2 = 0, then what is the value of (3x2 – 2xy + 5y2)?
If x + 1/y = 2, then what is the value of {(x2y + 4xy + x)(2 – x)}/(2xy – x2y)?
What is the maximum value of the function f(x, y) = x2(1 + 3y) + x3 + y3 + y2(1 + 3x) + 2xy over the region x=0; y=0; x + y=1.
If x = b + c - 2a, y = c + a - 2b, z = a + b - 2c, then the value of x2 + y2 - z2 + 2xy is?