Trigonometric Equations Question 211
Question: In $ \Delta ABC, $ if $ 2(bc\cos A+ca\cos B+ab\cos C)= $
Options:
A) 0
B) $ a+b+c $
C) $ a^{2}+b^{2}+c^{2} $
D) None of these
Show Answer
Answer:
Correct Answer: C
Solution:
- On putting the values of $ \cos A,\cos B $ and $ \cos C $ , we get the required result i.e., $ a^{2}+b^{2}+c^{2} $ .
BETA
