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Question No.5 (i)
11 Views • Sep 29, 2015
Description
Question No.5 (i)
Q5: Prove that:
(i): cos 20° cos 40° cos 60° cos 80°=1/16
Ans: =1/16=R.H.S
Example 5 (page 335) solve yourself.
Trigonometric Identities
Chapter No 10
Exercise No 10.4
Mathematics
part 1
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