Question

cos 24°+cos 55°+cos 125°+cos204°+cos300°​

Answer 1

Answer:

1/2

Step-by-step explanation:

Cos(24°) + cos(5°) + cos (175°) + cos (204°) + cos (300°)☺

= Cos(24°) + cos(5°) + cos (180° - 5°) + cos (180° + 24°) + cos (360° - 60°)

we know that......cos (180° +x ) = - cos x & cos (180° -x ) = - cos x & cos (360° - x) = cos x

so using

= Cos(24°) + cos(5°) - cos ( 5°) - cos ( 24°) + cos ( 60°)

= cos (60° )

= 1/2