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Question

If tanAtanB=x,cotBcotA=y and(sec(AB)1)(sec(AB)+1)=xayb(x+y)c, then find the value of a+b+c.

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Solution

If tanAtanB=x,cotBcotA=y..................
(sec(AB)1)(sec(AB)+1)
=sec2(AB)1=tan2(AB)=(tanAtanB1+tanAtanB)2.....(i)
y=cotBcotA=tanAtanBtanAtanB=xtanAtanB
tanAtanB=xy.............(ii)
from (i) and (ii), we get
(sec(AB)1)(sec(AB)+1)=(x1+(x/y))2
=x2y2(x+y)2
a=b=c=2
a+b+c=6


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