所屬科目：研究所、轉學考(插大)◆工程數學
4. Find the value of by solving the initial value problem for the given system of differential equations, where H(t-a) is unit step function or Heaviside function. Show the details. (20%)
5. Let vector field F=-yi+xyj-xyzk. Evaluate the value of , where Σ is the part of the cone . Showthedctails. (20%)
6.Evalbluate(10%)
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by solving the initial value problem for the given system of differential equations, where H(t-a) is unit step function or Heaviside function. Show the details. (20%)
, where Σ is the part of the cone 
. Showthedctails. (20%)
(10%)