निम्नलिखित प्रत्येक व्यंजको को सरल कीजिए :
(ii) ` (x+ y- 2z)^(2) - x^(2)- y^(2) - 3z^(2)+ 4xy`

Simplify: (x+y-2z)^(2)-x^(2)-y^(2)-3z^(2)+4xy

Factorise : 4xy -x^(2) - 4y^(2) + z^(2)

Simplify: (x+y-2z)^2-x^2-y^2-3z^2+4x y

Simplify : (x- 2y + 3z ) ( x^(2) + 4y^(2) + 9z^(2) + 2xy + 6yz - 3xz)

If x = 1, y = 2 and z = 5, find the value of (i) 3x - 2y + 4z (ii) x^(2) + y^(2) + z^(2) (iii) 2x^(2) - 3y^(2) + z^(3) (iv) xy + yz - zx (v) 2x^(2) y - 5yz + xy^(2) (vi) x^(3) - y^(3) - z^(3)

Evaluate : (2x-y+3z)(4x^(2)+y^(2)+9z^(2)+2xy+3yz-6xz)