A) Acute - angled
B) Obtuse - angled
C) right - angled
D) Nothing can be said
Correct Answer: A
Solution :
tanA + tanB +tanC = tanA tanB tanC > 0 \[\Rightarrow \]either all of \[tanA,\]\[tanB\] & \[\text{t}anC\] are \[+ve\] or two are \[ve.\] But in any triangle two angles are never obtuse \[\therefore \,\,\,tanA,tanB,tanC>0\]You need to login to perform this action.
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