A student is finding the derivative of f(x)=1+0.2x−cos(πx) Their steps are numbered 1-3 below. Is there an error in one

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A student is finding the derivative of f(x)=1+0.2x−cos(πx) Their steps are numbered 1-3 below. Is there an error in one

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A student is finding the derivative of f(x)=1+0.2x−cos(πx) Their steps are numbered 1-3 below. Is there an error in one of the steps? 1. dxd​f(x)=dxd​1+dxd​0.2x−dxd​cos(πx) 2. =0+0.2−−sin(πx) 3. =0.2+sin(πx) Yes, there is an error in step 3. Yes, there is an error in step 1. Yes, there is an error in step 2. No, there is no error.
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