Differentiate: F(t) = e^7tsin2t

for calculus assignment the answer i got was

e^7t (7sin2t+2cost2t) but it says this is wrong

would greatly appreciate it if anyone can spot the mistake

y = e^(7t) sin(2t)
y' = e^(7t) (7 sin(2t) + 2 cos(2t))

Edit: yes it's the same as yours i.e cos(2t) not cost2t. Proper use of parenthesis/brackets is almost crucial, so that could be the problem in this case.

All the best.

Oh you are welcome, and you are doing a good job just keep it up and don't ever give in.

Regards.

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