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Use product rule f(x) • g(x) = (f '(x) • g(x)) + (f(x) • g'(x)).

is that the chain rule?

Sin 2t
Cos . 2t. 2= 2 cos(2t)
e^4t
e^ . 4t . 4= 4e^4t

It is both chain rule and product rule i guess Jnlucero u r right to say it is chain rule

Is this of any help erfan1234567

yes