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Math Help - derivatives of trig functions

  1. #1
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    derivatives of trig functions

    find the equation of the line tangent to the graph of tanx at x=0 and x=pie/4

    not really sure how to even start this problem
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  2. #2
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    x=0 and x=pie/4 are separate problems
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  3. #3
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    Well, if you're finding tangent lines, there's a good chance you're dealing with derivatives. The derivative of \tan x is \sec^2 x. So you have to evaluate \sec^2 x at both values of x to determine the slope m of the tangent line, and then it would probably be easiest to write the equation of the line in point-slope form using the point (x_1, y_1) on the tangent graph where the line is actually tangent to the curve: y - y_1 = m(x - x_1)
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