We know that sin2x=2sinxcosx
(search the net for proof if you wish)
So the original equation becomes
2sinxcosx-sinx=0
The two terms both have sinx that can be taken out to get:
sinx(2cosx-1)=0
This is true if sinx=0 or 2cosx-1=0 , rewritten: cosx=1/2
sinx=0 than x=2kπ
cosx=1/2 than x=π/3+2kπ
where k is an integer
Answer:
6
Step-by-step explanation:
You need to divide it.Then you get 18 divided by 3.Which is 6
Is 10 and 15 because they both have a value of .909
The absolute value of -3 is 3 and -3 so both would be right
20 is permutation
22 is counting principle
Hope it help.
