Asked by Yuni
prove cos(x+y) / cos(x-y) = (1-tan x tan y)/(1+tan x tan y)
Answers
Answered by
Reiny
LS = (cosxcosy - sinxsiny)/(cosxcosy + sinxsiny)
divide the numerator and the denominator by cosxcosy and see how it comes apart into the RS.
divide the numerator and the denominator by cosxcosy and see how it comes apart into the RS.
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