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Question: Error in the eval command

Question:Error in the eval command

mehran rajabi 120 Maple
eval diff heaviside
February 06 2019
0

Hi everyone:

I want to calculate the value of eval(diff(y, x), x = 0.418e-1)-eval(diff(y, x), x = 0.1e-1), how?

y := (1-Heaviside(x-0.10e-1))*(cos(9.0218219*x)-.99533285*sin(9.0218219*x)-.99999991*cosh(9.0218219*x)+.99533285*sinh(9.0218219*x))+(Heaviside(x-0.10e-1)-Heaviside(x-0.418e-1))*(.24369100*cos(7.7520047*x)-.36109859*sin(7.7520047*x)-.23739778*cosh(7.7520047*x)+.19615343*sinh(7.7520047*x))+Heaviside(x-0.418e-1)*(.95680995*cos(9.0218219*x)-.80884870*sin(9.0218219*x)-1.0381918*cosh(9.0218219*x)+1.1704059*sinh(9.0218219*x))

with regards...
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