Tan Definition and 152 Threads

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  1. P

    What Did I Do Wrong? Analyzing y = x tan x

    y = x tan x y' = tan x + x*sec^2(x) y'' = sec^2(x) + d/dx (x*sec^2(x)) = ... + (d/dx(sec^2(x)) + sec^2(x)) = ... + (2secx + sec^2(x)) = 2sec^3 x + sec^4(x) what did I do wrong?? in book it says y'' = something else.
  2. K

    What are Sin hx, Cos hx, Tan hx in Mathematics?

    sin hx, cos hx, tan h x... What are they? What does the "h" mean here? Any explanations or websites would be appreciated. :smile:
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