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ashley.love17

  • 3 years ago

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

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  1. ashley.love17
    • 3 years ago
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    So far I got cosxcosy-sinxsiny/cosxsiny

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

  3. ashley.love17
    • 3 years ago
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    Thank you I got it!

  4. asnaseer
    • 3 years ago
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    yw :)

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