Let O be the origin, and and be three unit vectors in the directions of the sides Q R , R…
Mathematics · JEE Advanced · NTA Exams — Trigonometry
Let O be the origin, and 
and be three unit vectors in the directions of the sides \(\overrightarrow{Q R}, \overrightarrow{R P}, \overrightarrow{P Q},\) respectively, of a triangle PQR.
If the triangle PQR varies, then the minimum value of cos(P + Q) + cos(Q + R) + cos(R + P) is
and be three unit vectors in the directions of the sides \(\overrightarrow{Q R}, \overrightarrow{R P}, \overrightarrow{P Q},\) respectively, of a triangle PQR.If the triangle PQR varies, then the minimum value of cos(P + Q) + cos(Q + R) + cos(R + P) is
Answer
(B)
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