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Ashish hiralkar

· started a discussion

· 1 Months ago

3 line (Question: 198509.0 )

3 line explaination plz ?? where is cos 60 came from ???

Question:
Find the value of cos 10º + cos 110º + cos 120º + cos 130º.
Options:
A) \(-\cfrac{1}{2}\)
B) 0
C) 1
D) 2
Solution:

Knowledge Expert

· commented

· 1 Months ago

@Sudhir Banger Good :)

Sudhir Banger

· commented

· 1 Months ago

cos120=cos(180-60)= -cos60 [angle 120 lies in 2nd quadrant so it will be negative becoz in 2nd quadrant cos always be negative
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