Tan*x=k*cot*y then [cos (x-y)]/[cos (x+y)]=
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cos(x-y) /cos(x+y)
=(cosxcosy+sinxsiny) /(cosxcosy-sinxsiny)
Dividing up and down by cosxcosy
=(1+tanxtany)/(1-tanxtany)
Also tanxtany=k
=(1+k)/(1-k)
Hope it helps
If yes please mark brainliest
=(cosxcosy+sinxsiny) /(cosxcosy-sinxsiny)
Dividing up and down by cosxcosy
=(1+tanxtany)/(1-tanxtany)
Also tanxtany=k
=(1+k)/(1-k)
Hope it helps
If yes please mark brainliest
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