\[A:\,\,\cos {{\theta }_{1}}+\cos {{\theta }_{2}}+\cos {{\theta }_{3}}=0\] |
\[B:\,sin{{\theta }_{1}}+sin{{\theta }_{2}}+sin{{\theta }_{3}}=0\]. |
A) A is true and B is false
B) A is false and B is true
C) both A and B are true
D) both A and B are false
Correct Answer: C
Solution :
\[{{(\cos {{\theta }_{1}}+\cos {{\theta }_{2}}+\cos {{\theta }_{3}})}^{2}}+{{(\sin {{\theta }_{1}}+\sin {{\theta }_{2}}+\sin {{\theta }_{3}})}^{2}}=0\]You need to login to perform this action.
You will be redirected in
3 sec