Question

Simplify -3sin(x)-4sin(x)

Answer 1

Factor out sin(x), usung the distributive property of multiplication over addition.

Answer 2

Sorry -3sin(x)-4sin(2x)

Answer 3

sin(2x) = 2sin(x)cos(x), then what I said before.

Answer 4

Thanks will you help me solve ln(8x)-x=0

Answer 5

It can't be done conveniently. Are you prepared to utilize numeric algorithms?

Answer 6

Thank you but no

Answer 7

But then can you help me find the points of inflection of 3sin(x)+sin(2x) please

Answer 8

Is ther a rule about one questin per thread?

You'll need a 1st derivative. Let's see what you get.

Answer 9

Sin(x)(-11cos(x)?

Answer 10

Hello

Answer 11

How did you get that?

(d/dx)(3sin(x)+sin(2x)) = 3cos(x) + cos(2x)*2

Answer 12

Oh i took the derivative of the one you just wrote. I think

Answer 13

So the second derivative ..

Answer 14

(d/dx)(3cos(x) + cos(2x)*2) = -3sin(x) - 2sin(2x)*2

And we have where this conversation started.

Answer 15

Good work

Answer 16

So did i get the first deriativ right?

Answer 17

I mean second sorry agaim

Answer 18

Seems like it, but I don't actually know the question, so it's pretty hard to say.

Answer 19

Do you remember how to find points of inflection?

Answer 20

Are you old

Answer 21

Im sorry for the trouble

Answer 22

If you want you dont hav to help

Answer 23

Just say goodbye

Answer 24

:)

Answer 25

Oh, are we finding points of inflection? You really shoudl state the entire problem in the beginning. A piece at a time is a little annoying.

So, there you have it. -3sin(x) - 2sin(2x)*2 = -3sin(x) - 4sin(2x) = -3sin(x) - 8sin(x)cos(x) = -sin(x)(3 + cos(x))

Don'y spend too much time ont he second factor! Okay, now I'm out.