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Asked by BhavSimran | 10th Mar, 2010, 12:05: PM

Expert Answer:

let angle C be acute, or obtuse.

draw AD perpendicuar to BC(or BC produced if necessary)


cosC =CD/CA


CD=CA cosC

let a=BC



then we get,

from this we can get the required result.

 note that going along  similar lines we can prove the result even if C is an obtuse angle.

Answered by  | 10th Mar, 2010, 03:50: PM
