Convert 5cos(5π3)cos(5π3) as a sum of trigonometric ratios?
1 Answer
Mar 29, 2017
=
Explanation:
As
adding the two we get
Hence
=52×2cos(5π3)cos(5π3)
=52×(cos(5π3+5π3)+cos(5π3−5π3))
=52×(cos(10π3)+cos0) , butcos0=1
Hence