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Math Help - Finding normal and tangent of a curve

  1. #1
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    Finding normal and tangent of a curve

    Ok, i generally know how to find a tangent and it's normal by applying the f(a+h)+f(a)/h formula, but this equation apparently has tan(trig) and I have no idea how to deal with it:
    y=2tan(pix/4) at x =1
    Please explain to me how you get your answer thank you.
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  2. #2
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    Quote Originally Posted by maximade View Post
    Ok, i generally know how to find a tangent and it's normal by applying the f(a+h)+f(a)/h formula, but this equation apparently has tan(trig) and I have no idea how to deal with it:
    y=2tan(pix/4) at x =1
    Please explain to me how you get your answer thank you.
    are you aware of the general formula for the derivative of the tangent function ?

    \frac{d}{dx} \tan{u} = \sec^2{u} \cdot \frac{du}{dx}

    finding the value of the derivative using the limit definition is going to be a bit long and overwhelming algebra-wise.
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