1.

In triangle ABC, D is mid point of BC, if 'AD' is perpendicular to 'AC then cos A cos C

Answer»

`(2(c^(2)-a^(2)))/(3ac)`
`(c^(2)-a^(2))/(2ac)`
`(c^(2)-a^(2))/(AC)`
`(c^(2)+a^(2))/(2ac)`

ANSWER :B


Discussion

No Comment Found