How is this wrong?

I got PFs at pi, 1.823, and 4.46 with concave up: (1.823, pi) (4.46, 2pi) and concave down: (0, 1.823) (pi, 4.46)


Yeah sorry, the original equation was 2sin(x)+sin(2x)

Attachment image

2 Answers

  • 4 weeks ago

    For x=0, the graph has gradient = 0.

    But your step 2  gives gradient = 2cos(0) + 2cos(2*0) = 4.

    So you've probably made a mistake going from step1 (starting equation) to step 2.

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  • 4 weeks ago

    I agree with your answer. Are you entering answers into software?  Maybe it's the format that's wrong.

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    • Lenny4 weeks agoReport

      I'm posting it on, but this guy said it was wrong and, since I haven't done this stuff in years, it made me uncertain. Thank you for your help!

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