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Given that a , b , c , are the side of a...

Given that `a , b , c ,` are the side of a ` A B C` which is right angled at `C ,` then the minimum value of `(c/a+c/b)^2` is 0 (b) 4 (c) 6 (d) 8

A

0

B

4

C

6

D

8

Text Solution

Verified by Experts

The correct Answer is:
D

`a=c sin theta, b=c cos tehta`
`rArr ((c)/(a)+(c)/(b))^(2)=((1)/(sin theta)+(1)/(cos theta))^(2)=(4(1+sin2theta))/(sin^(2)2theta)`
`=4((1)/(sin^(2)2theta)+(1)/(sin 2theta))`. Where `0ltthetalt(pi)/(2)`
`rArr ((c)/(a)+(c)/(b))^(2)=8`, when `2theta=90^(@)`.
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