I don't understand what happened to (h). If sec^2 (x) goes to 1 why isn't the limit 1

SmartJoe4

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Answer No.1

Anonymous

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H is part of a function name, not a constant. cosh(x) = ( e^x + e^(-x) ) / 2 sech(x) = 2 / ( e^x + e^(-x) ) sinh(x) = ( e^x - e^(-x) ) / 2 tanh(x) = sinh(x) / cosh(x) The derivative of tanh(x) is sech^2(x).

Answer No.2

Anonymous

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Tanh(x) stands for the hyperbolic tangent of x. In case you are confusing it to tan times h (tan x h) that is not the case

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