SOLUTION: If cosα=0.173 and cosβ= 0.432 with both angles’ terminal rays in Quadrant-I, find the values of cos(α+β)= cos(α-β)= (Your answers should be accura

Algebra ->  Trigonometry-basics -> SOLUTION: If cosα=0.173 and cosβ= 0.432 with both angles’ terminal rays in Quadrant-I, find the values of cos(α+β)= cos(α-β)= (Your answers should be accura      Log On


   

Question 1112994: If cosα=0.173 and cosβ= 0.432 with both angles’ terminal rays in Quadrant-I, find the values of
cos(α+β)=
cos(α-β)=
(Your answers should be accurate to 4 decimal places.
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
sin%28alpha%29+=+sqrt%281-cos%28alpha%29%5E2%29

cos%28alpha%29=0.173 , we calculate sin %28alpha%29=0.9849
cos%28beta%29=0.432 we can calculate Sin %28beta%29 = 0.9019
cos%28%28alpha%29%2B%28beta%29%29= cos%28alpha%29%2Acos%28beta%29%2B+sin%28alpha%29%2Asin%28beta%29
plug the values in the identity