If the pair of lines x2 − 2cxy − y2 = 0 and x2 − 2dxy− y2 = 0 be such that each pair bisects the anglebetween the other pair, prove that cd = −1.

If the pair of lines x2 − 2cxy − y2 = 0 and x2 − 2dxy
− y2 = 0 be such that each pair bisects the angle
between the other pair, prove that cd = −1.

Matching exercise

Match the items on the right to the items on the left.

Step - 1

Step - 2

Step - 3