Question
Fri February 18, 2011 By: Adesh Singh
If cos(x+y)=4/5, sin(x-y)=5/13 and x,y lie between 0 and

If cos(x+y)=4/5, sin(x-y)=5/13 and x,y lie between 0 and pi/4, then find the value of tan2x.

Expert Reply
Mon February 21, 2011
dear student,
let
x+y=A
x-y=B
2x= A+B
tan 2x
=
now put the values.
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