anonymous
  • anonymous
solve sin^2 x +2 sinx cosx = 0
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
sinx(sinx+2cosx) = 0 What can you do now? think.
anonymous
  • anonymous
if a*b = 0, Either a = 0 or b = 0 Here, a = sinx and b = sinx + 2cosx
anonymous
  • anonymous
i don't think this is that easy

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anonymous
  • anonymous
that is \(\sin(x)=0\) is easy enough to solve, you get \(x=n\pi, n\in \mathbb{Z}\) but i can't see a good way to solve \[\sin(x)=-2\cos(x)\]
TheViper
  • TheViper
\[sin^2x+2\ sin\ x\ cos\ x=0\] \[sin\ x(sin\ x+2\ cos\ x)=0\] \[(sin\ x+2\ cos\ x)=0\]
anonymous
  • anonymous
that is not to say you cannot do it, but it is going to take some work
anonymous
  • anonymous
the first thing you have to do to solve \[\sin(x)+2\cos(x)=0\] is to write it as a single function of sine
anonymous
  • anonymous
in general you can write \[a\sin(x)+b\cos(x)\] as \[\sqrt{a^2+b^2}\sin(x+\theta)\]
anonymous
  • anonymous
:'( i need help on mine
ParthKohli
  • ParthKohli
I kinda wonder if you could do \(\sin^2(x) + \sin(2x)=0\).
anonymous
  • anonymous
in this case you get \[\sin(x)+2\cos(x)=\sqrt{5}\sin(x+\theta)\] where \(\tan(\theta)=2\)
anonymous
  • anonymous
tanx = -2 x = atan(-2) + n*(pi)
anonymous
  • anonymous
therefore \(x+\theta=n\pi\) gives \(\theta=n\pi-\tan^{-1}(2)\)
anonymous
  • anonymous
you can check that it is right by looking here http://www.wolframalpha.com/input/?i=sin%28x%29%2B2cos%28x%29
anonymous
  • anonymous
@ParthKohli i don't think that identity is going to help in this case you will have two arguments, one of \(x\) and the other of \(2x\) if you have a solution from that approach i would love to see it
TheViper
  • TheViper
oh I had forgotten this site Thanx @satellite73 for remembering :)
ParthKohli
  • ParthKohli
Gaahh @satellite73 you were right.

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