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shashank yadav

· started a discussion

· 1 Months ago

error (Question: 569953.0 )

cos 60=sqrt3/2.....not 1/2

Question:

Find the value of cos 24º + cos 55º + cos 125º + cos 204º + cos 300º.

Options:
A)

32    

B)

0

C)

1

D)

12    

Solution:

Ans: (d)

cos 24º + cos 55º + cos 125º + cos 204º + cos 300º

= cos 24º + cos 55º + cos(180º – 55º) + cos(180º + 24º) + cos(360º – 60º)

= cos 24º + cos 55º – cos 55º – cos 24º – cos 60º

= cos 60º

=  12     

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