Q83
The value of following is, cos24° + cos55° + cos125° + cos204° + cos300° ?
A.
B.
Answer
C.
2
D.
1
Answer: Option B
Solution
Answer: Option B
Solution:
The value of,cos24° + cos55° + cos125° + cos204° + cos300°
We know that, cos(180° θ) = -cosθ
⇒ cos24° + cos55° + cos (180° - 55°) + cos (180° + 24°) + cos (360° - 60°)
⇒ cos24° + cos55° - cos55° - cos24° + cos60°
⇒ cos60°
⇒