Product rule with chain rule (derivation wrt time)

I'm trying to find the derivative of 0 = 3xcosƟ with respect to time.

I know I should use the product rule for x and cosƟ. But I don't know what I should do with the constant 3.

would it be like this?

0 = 3x(-sinƟ)(dƟ/dt) + 3(dx/dt)(cosƟ)
 
225
0
Yes, that's correct.
 
thank you
 

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