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March 24, 2017

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Show that tanx = sinx / cosx
can be written as
tan(x+y) = (tanx + tany) / (1 - tanxtany)

  • advanced functions - ,

    rewrite the left side as
    sin(x+y)/cos(x+y), then use the addition formulas for both. It will simplify (finally) to the right.

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