anonymous
  • anonymous
sin(cos^-1x)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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hartnn
  • hartnn
let cos^-1 x = u so, cos u =x so u just need sin u , from cos u =x.....
hartnn
  • hartnn
know the relation between sin and cosine ?
hartnn
  • hartnn
no ? \(\large \sin^2 x+\cos^2x=1\)

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anonymous
  • anonymous
I suck at Calc and dont know im doing it correctly
anonymous
  • anonymous
And I dont know the relation
hartnn
  • hartnn
tell me whether you can get sin u knowing that cos u = x from the relation, sin^2 u +cos^2 u =1
hartnn
  • hartnn
now you know :)
anonymous
  • anonymous
Thanks
NoelGreco
  • NoelGreco
The easiest method to use in this type of problem is to draw a picture. \[\cos^{-1} x\] implies that someone took the cosine of an angle and got the number x. What would the triangle look like?|dw:1371424058046:dw| Now, using the Pythagorean Theorem, figure out the side opposite the angle and calculate the sin Note that you never have to calculate the angle. This works for all 6 trig functions.
anonymous
  • anonymous
Okay Kool. Thanks

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