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Pandey Ji

· started a discussion

· 1 Months ago

explain (Question: 198509.0 )

plz explain 3rd line of solurion

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

Hi Pandey Ji, please apply trigonometric formula:

cosA + cosB = 2 cos[(A+B)/2] cos[(A-B)/2]
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