gjhfdfg
Help me complete this identity?



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gjhfdfg
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sin ( a + b )
/
cos a cos b

Fgcbear16
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dw:1360612896526:dw

Fgcbear16
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is that what you needed or are you saying

Fgcbear16
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dw:1360612985267:dw

gjhfdfg
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The last one, \[\frac{ \sin ( a + b ) }{ \cos a \cos b }\]

Fgcbear16
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so you need to simplify?

Fgcbear16
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dw:1360613311639:dw

Fgcbear16
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sin(a+b)=sinacosb + cosasinb
so i replaced it

gjhfdfg
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& then what do I do to that?

Fgcbear16
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dw:1360613737294:dw

Fgcbear16
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dw:1360613941761:dw

Fgcbear16
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what is sina/cosa and sinb/cosb

gjhfdfg
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Is it tan a + tan b?

Fgcbear16
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yes!

gjhfdfg
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Got it.!

Fgcbear16
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I am happy to hear it!

Fgcbear16
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;)