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if x^(2) -2xcos(a) +1=0 and y^(2) -2ycos(b)+1=0 t hen 2cos(a+b) = ? answer is xy + 1/xy .how is it?? my answer is coming x/y + y/x

if x^(2) -2xcos(a) +1=0  and y^(2) -2ycos(b)+1=0


then 2cos(a+b) = ?


answer is xy + 1/xy .how is it??


my answer is coming x/y + y/x

Grade:12

1 Answers

Amit Jain
askIITians Faculty 32 Points
7 years ago

486_96662_Trigonometry_Trigonometry_08 Nov 2013 0705PM_Sanaa W.gif

 

Thanks & Regards
Amit Jain, 
askIITians Faculty
B.Tech., IIT Delhi

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