anonymous
  • anonymous
Prove: cos(x+y)/cosxsiny=coty-tanx
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
So far I got cosxcosy-sinxsiny/cosxsiny
asnaseer
  • asnaseer
you are almost there, split the numerator into two and then simplify:\[\frac{\cos(x+y)}{\cos(x)\sin(y)}=\frac{\cos(x)\cos(y)-\sin(x)\sin(y)}{\cos(x)\sin(y)}=\frac{\cos(x)\cos(y)}{\cos(x)\sin(y)}-\frac{\sin(x)\sin(y)}{\cos(x)\sin(y)}\]
anonymous
  • anonymous
Thank you I got it!

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asnaseer
  • asnaseer
yw :)

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