Question 1163771: 1)Find d/dx sin(a+x),first by using the chain rule and secondly by using the addition formula to expand sin(a+x)before differentiation. Verify that get the same answer by both methods.
2)Find d/dx cos(3/2 pai-x).Check your answer by simplifying cos(3/2 phi-x) before you differentiation, and sin(3/2 pai -x) after you differentiation.
3)Show that d/dx (2cos^2 x),d/dx(-2sin^2 x) and d/dx cos2x are all the same.Explain why.
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! 1)Find d/dx sin(a+x),first by using the chain rule and secondly by using the addition formula to expand sin(a+x)before differentiation. Verify that get the same answer by both methods.
2)Find d/dx cos(3/2 pai-x).Check your answer by simplifying cos(3/2 phi-x) before you differentiation, and sin(3/2 pai -x) after you differentiation.
3)Show that d/dx (2cos^2 x),d/dx(-2sin^2 x) and d/dx cos2x are all the same.Explain why.
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All good ideas.
Why don't you do that?
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