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Grade 12 Math  Trigonometry Question. 
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#1
May712, 06:31 PM

P: 4

1. The problem statement, all variables and given/known data
tanxsinx+sinx=0 0≤x≤2∏ What is the largest domain given? Problem. I'm not sure what to do with this question. It's probably pretty simple, but I'm absolutely rubbish at math. Hopefully someone can help me with this? Thanks. Lily 


#2
May712, 06:58 PM

P: 867

Try factoring out a sin from the left side, and use the zero product property to solve.



#3
May712, 06:59 PM

P: 784

Well it's asking you in the domain 0 to 2pi when is that equation zero. So the first think I would do is pull a sin(x) out of the left hand and then you can split the equation up in two things, with the correct solutions being when either one is zero.



#4
May812, 12:57 AM

P: 4

Grade 12 Math  Trigonometry Question.
So, I'm assuming this?
tanxsinx+sinx=0 sinx(tanx + 1) = 0 sinx = 0 x = pi tanx = 1 x = 3pi/4 , 7pi/4 


#5
May812, 01:18 AM

HW Helper
P: 3,531




#6
May812, 01:21 AM

P: 4

I'm not quite sure I follow?



#7
May812, 01:54 AM

HW Helper
P: 3,531

Remember the domain is [itex]0\leq x \leq 2\pi[/itex]. So where is [itex]\sin(x)=0[/itex] in this domain? Surely more places than just at [itex]x=\pi[/itex]. Take x=0 for example.



#8
May812, 01:56 AM

P: 4

Oh, I get it! Thanks everyone!



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