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What is the default parameter for dsolve() command?

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What is the default parameter for dsolve() command?

(a) t

(b) No default parameter

(c) Input differentiating variable

(d) Defined input parameter

I had been asked this question in semester exam.

My doubt is from Default Variables topic in chapter Beyond the Basics of MATLAB

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Best answer
The correct answer is (c) Input differentiating variable

The explanation is: The dsolve command returns a solution which is parameterized by the variable that has been used as a differential in the input function. As such, there is no default variable for this command.

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