Question

use addition or sub to simplify sin θ cos 3θ + cos θ sin 3θ = 0

Answer 1

Remember that \(\sin(x+y)=\sin(x)\cos(y)+\sin(y)\cos(x)\).

Answer 2

okay

Answer 3

At least it looks like they want you to use that property.

Answer 4

So identify what corresponds to what. What does x correspond to and what does y correspond to.

Answer 5

xis theta y 3 theta

Answer 6

So then what is \(\sin(x+y)\)?

Answer 7

sin 4 theata

Answer 8

???

Answer 9

ya its \[\sin (4\theta)=0\]

Answer 10

and on the interval of o to 2pi???

Answer 11

what the values of theta on this interval

Answer 12

i dont knoe

Answer 13

i mean u need to find what in this interval

Answer 14

i dont know how tho