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In a Delta ABC , if D is the mid point ...

In a `Delta ABC ` , if D is the mid point of BC and AD is perpendicular to AC , then `cos B `=

A

`(2b)/a`

B

`(-b)/c`

C

`((b^(2) + c^(2)))/(ca)`

D

`((c^(2) + a^(2)))/(ca)`

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The correct Answer is:
C
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AAKASH SERIES-PROPERTIES OF TRIANGLES-LECTURE SHEET EXERCISE - I ( Straight Objective Type Questions )
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