निम्न समतलो के मध्य कोण ज्ञात कीजिए -
`x + y + 2z = 9` और `2x - y + z = 15`

If x + y = 2z then (x)/(x-z) +(z)/(y-z) = ?

What is the proportion equivalent to x/y :y/z:x/z , if X : Y :Z = 4 : 7 : 9? x/y :y/z:x/z के समतुल्य समानुपात ज्ञात करें , यदि X : Y : Z = 4 : 7 : 9 है |

Prove that the lines 3x + 2y + z – 5 = 0 = x + y – 2z – 3 and 2x – y – z = 0 = 7x + 10y – 8z – 15 are perpendicular

Solve the following set of equations 2x+3y -z = 9; x +y +z = 9; 3x - y - z = -1 .

Solve the system: x + y - 2z = 0, 2x - 3y + z = 0, 3x - 7y + 10z = 0, 6x - 9y + 10z = 0.

Prove that Det [[x + y + 2z, x, y], [z, y + z + 2x, y], [z, x, z + x + 2y]] = 2 (x + y + z) ^ 3