i"m trying to replace theta1 and theta2 to x1,x2,x3,x4. What is wrong with this replace method?

  • 1
    $\begingroup$ Please post code not images. Look here to figure out how. Once you do that we can help you. $\endgroup$ – b3m2a1 Dec 5 '17 at 21:52
  • $\begingroup$ One obvious error is theta1' means nothing. theta1'[t] does $\endgroup$ – Bill Watts Dec 6 '17 at 0:19
  • $\begingroup$ i tried it using thetat1'[t] -> x2[t], same error occurs $\endgroup$ – Hussein Dec 6 '17 at 9:41

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