Fast martin simplified the composed function f(x)=sin(arctan x). his work is shown below. step 1: f(x)=sina, where a=arctan x and x = tana step 2: tana= opp/adj=x/1 step 3: hypotenuse= square root of 1^2-x^2= square root of 1-x^2 step 4: sina=opp/hyp=x/squareroot 1-x^2 in which step did martin make is first error?

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