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>> diff(-0.000000000216555 *t.^6+0.000000010399552 *t.^5+0.000001037995352 *t.^4-0.000080553437172 *t.^3+0.001572861417838 *t.^2+0.007249825838703 *t+0.103323003228512,'t',1)

ans =

-25132697363198019/19342813113834066795298816*t^5+15715358656531195/302231454903657293676544*t^4+4901794459659279/1180591620717411303424*t^3-17831383677234309/73786976294838206464*t^2+3626771504783691/1152921504606846976*t+8358480114095059/1152921504606846976

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>>df=diff(-0.000000000216555 *t.^6+0.000000010399552 *t.^5+0.000001037995352 *t.^4-0.000080553437172 *t.^3+0.001572861417838 *t.^2+0.007249825838703 *t+0.103323003228512,'t',1)
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