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Eamcet Mathematics
Trigonometry Properties of Triangles
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Q.
In ΔABC,if 2(bc cosA+ca cosB+ab cosc)=
A.
0
B.
a + b + c
C.
a
2
+ b
2
+ c
2
D.
2
E.
None of the above
View Answer
Correct choice: C
Explanation:
On putting the values of cosA,cosB and cosC , we get the required result i.e., .a
2
+b
2
+c
2
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