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trig

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find the values of x between 0 and 2 pi where the tangent line to the graph of y = sinxcosx is horizontal

  • trig -

    Hmmmm. Wondering if you are taking calculus.

    Calculus
    y=sinxcosx
    y'=0=cos^2x-sin^2x
    cos^2x=sin^2x
    tan^2 x=1
    tanx= +-1
    which occurs at increments of 45 degrees

    x= +-PI/4, PI+-Pi/4

    check that

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