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

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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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