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If in DeltaABC, (cosA)/(7)=(cosB)/(19)=(...

If in `DeltaABC`, `(cosA)/(7)=(cosB)/(19)=(cosC)/(25)=k`, then :
`|{:(-(1)/(k),25,19),(25,-(1)/(k),7),(19,7,-(1)/(k)):}|` equals

A

`0`

B

`26-sec^(3)C`

C

`32-sec^(2)B`

D

`42-sec^(3)A`

Text Solution

Verified by Experts

The correct Answer is:
A
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