# i get -0.017453 as an answer to derivative of cos i get -0.017453sin x... as an answer to derivative of cos x, but why is not showing as just sin x,, that is the right answer

asked by

Steven J.

on

15 Apr, 2018

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The differentiation rules for trigonometric functions you have been taught (ex: derivative of sin(x) is cos(x) ) are correct if the angle unit is in radians. If you use any other angle units (ex: degrees, grads) there will be a conversion factor :derivative of sin(ax) with respect to x is a.cos(ax).

Hope that helps

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