anonymous
  • anonymous
Find all solutions to the equation in the interval [0, 2π). cos 4x - cos 2x = 0
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
A. 0, two pi divided by three., four pi divided by three. B.pi divided by six, pi divided by two., five pi divided by six, seven pi divided by six, three pi divided by two., eleven pi divided by six C. 0, pi divided by three., two pi divided by three., π, four pi divided by three., five pi divided by three. D. No solution
anonymous
  • anonymous
\[\cos C-\cos D=-2\sin \frac{ C+D }{2 }\sin \frac{ C-D }{ 2 }\]
jdoe0001
  • jdoe0001
\(\bf \textit{as indicated by} \text{ surjithayer} \textit{, use the sum identity of}\\ cos(\alpha - \beta) = -2sin\left(\cfrac{\alpha + \beta}{2}\right)sin\left(\cfrac{\alpha - \beta}{2}\right)\\\qquad \\ cos(4x) - cos(2x) = 0 \implies -2sin\left(\cfrac{4x + 2x}{2}\right)sin\left(\cfrac{4x - 2x}{2}\right) = 0\)

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anonymous
  • anonymous
hey sorry back ok what do I do?
Luigi0210
  • Luigi0210
Lets go Kramer, lets go *clap* xD
jdoe0001
  • jdoe0001
har har
anonymous
  • anonymous
lol im so lost -_- xD
anonymous
  • anonymous
\[-\sin 3X \sin X=0,\] Either Sin 3 x=0 Or Sin x=0 solve these two and get the value.

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