anonymous
  • anonymous
Trig help?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
|dw:1447039578828:dw|
anonymous
  • anonymous
I'm getting -11.475 =x which seems wrong.
anonymous
  • anonymous
It just seems like the angles don't add up correctly...like the theta's should be different.

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Nnesha
  • Nnesha
find x ?? what about the equation cos (2 theta) =2cos^2 theta -1 ?
anonymous
  • anonymous
the hint says to use that equation and when I solved for x it was a negative number. It doesn't make sense
Nnesha
  • Nnesha
i didn't get negative answer
Nnesha
  • Nnesha
how did you get -11 ?
anonymous
  • anonymous
I solved for theta using cos theta = 4/7 and then substituted that number into the equation.
Nnesha
  • Nnesha
hmm my first step was the same but i i didn't use the equation
Nnesha
  • Nnesha
for cos theta i got 55 |dw:1447041246749:dw| and then i use sin 20 to find x
anonymous
  • anonymous
it's a double angle so that equation is invalid
Nnesha
  • Nnesha
well that's the correct equation cos 2 theta is equal to 2cos^2 -1 hmm
anonymous
  • anonymous
sin2theta does not equal sin (theta times 2)

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