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ashley.love17 Group Title

Prove: cos(x+y)/cosxsiny=coty-tanx

  • one year ago
  • one year ago

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  1. ashley.love17 Group Title
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    So far I got cosxcosy-sinxsiny/cosxsiny

    • one year ago
  2. asnaseer Group Title
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    you are almost there, split the numerator into two and then simplify:\[\frac{\cos(x+y)}{\cos(x)\sin(y)}=\frac{\cos(x)\cos(y)-\sin(x)\sin(y)}{\cos(x)\sin(y)}=\frac{\cos(x)\cos(y)}{\cos(x)\sin(y)}-\frac{\sin(x)\sin(y)}{\cos(x)\sin(y)}\]

    • one year ago
  3. ashley.love17 Group Title
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    Thank you I got it!

    • one year ago
  4. asnaseer Group Title
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    yw :)

    • one year ago
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