Question

COS 24°
+ cos 55° + cos 125° + cos 2040 =
2 0
3)
4) 2
1)-1
.​

Answer 1

Step-by-step explanation:

Cos 24o + Cos 55o + Cos 125o + Cos 204o + Cos 300o = 1/2

Consider

LHS =Cos 24o + Cos 55o + Cos 125o + Cos 204o + Cos 300o

LHS = Cos 24o + Cos 55o + Cos (180o – 55o) + Cos (180o -24o) + Cos (270o + 30o)

LHS = Cos 24o + Cos 55o – Cos 55o – Cos 24o + Sin 30o

LHS = Sin 30o

LHS = 1/2

LHS = RHS

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Answer 2

Answer:

correct option is 2....hope this answer helps you...take care!