- #1

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## Homework Statement

y=e^9Θsin(8Θ)

## Homework Equations

## The Attempt at a Solution

dy/dΘ=e^9Θ(sin(8Θ)+8cos(8Θ))

- Thread starter neutron star
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- #1

- 78

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y=e^9Θsin(8Θ)

dy/dΘ=e^9Θ(sin(8Θ)+8cos(8Θ))

- #2

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[Edit] I didn't catch the missing 9; sorry about that.

Last edited:

- #3

lanedance

Homework Helper

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is that (using t for theta)

y=e^(9t.sin(8t)) or y=(e^(9t)).sin(8t)?

y=e^(9t.sin(8t)) or y=(e^(9t)).sin(8t)?

- #4

- 78

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Ugh, it said incorrect...

- #5

lanedance

Homework Helper

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y=(e^(9t)).sin(8t)

i think you should get an extra factor of 9

y'=(e^(9t)).(9sin(8t)+ 8cos(8t))

- #6

Pengwuino

Gold Member

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Lanedance is right, you get that factor of 9 when taking the exponential derivative.

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