(ii) cos 24° + cos 55° + cos 125° + cos204 + cos 300 = 1/2
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Given: cos 24° + cos 55° + cos 125° + cos204 + cos 300 = 1/2
Solution:
Step 1:
L.HS
=> cos 24° + cos 55° + cos 125° + cos204 + cos 300
=> Cos 24 + Cos 55 + Cos (180-55) + Cos (180+24)
+ Cos (360-60)
=> cos 24° + cos 55° - cos 55° - cos 24 + cos 60
=> Cos 60
=> 1/2 = R.H.S
Hence, Proveed
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