precalculus

Verify the identity: sin(A+B)/sin(A-B) = tan(A)+tan(B)/tan(A)-tan(B) Explain steps

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  1. sin(a+b)/sin(a-b)
    = (sina cosb + cosa sinb)/(sina cosb - cosa sinb)
    now divide top and bottom by cosa cosb and you get
    (sina/cosa + sinb/cosb)/(sina/cosa - sinb/cosb)
    = (tana + tanb)/(tana - tanb)

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    oobleck
  2. No

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  3. What do you mean no.....................

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  4. What do you mean no..............................

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