anonymous
  • anonymous
Solve sin(7x)cos(x) + cos(7x)sin(x) = sin(4x)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
From 0 to 2pi
anonymous
  • anonymous
LOL nice profile picture and name
anonymous
  • anonymous
Haha thanks

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anonymous
  • anonymous
try sum and difference identities?
anonymous
  • anonymous
Maybe, but I'm not supposed to know that for this course. Any other ideas?
anonymous
  • anonymous
what course is that?
anonymous
  • anonymous
Extension 1 Maths - Nsw Aus
anonymous
  • anonymous
subtract sin 4x from both sides and graph it
anonymous
  • anonymous
Graph it? Nah that would be cheating
anonymous
  • anonymous
graph it and sum/difference identities are the only ways I can think of to solve it
anonymous
  • anonymous
I'll give sum/difference a try
zepdrix
  • zepdrix
Yah on the left side we can see the `Angle Sum Identity for Sine` expanded out. So if we work it backwards, we might be able to get where we need to go. We currently have something like this: \(\large \sin a\cos b+\sin b\cos a\) which will simplify down to \(\large \sin(a+b)\)
anonymous
  • anonymous
Of course! Thanks
anonymous
  • anonymous
Yeah that's done it
anonymous
  • anonymous
yep, that's a sum identity as I said before. Thank you zepdrix

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