anonymous
  • anonymous
solve for x: sin ^-1 x + 2 cos^-1 x = 540/4
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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dan815
  • dan815
ugh it closed on me
dan815
  • dan815
|dw:1378195820460:dw|
dumbcow
  • dumbcow
hmm i get no solution...i think it should be in radians so equal to 3pi/4 instead of 540/4 @dan815 ,yeah that sucks especially when it happen right before you're finished

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dan815
  • dan815
|dw:1378196089636:dw|
dan815
  • dan815
|dw:1378196219094:dw|
dan815
  • dan815
|dw:1378196229628:dw|
dan815
  • dan815
ya was 540 in degrees or something
dan815
  • dan815
this is solvable but answers not that nice
dan815
  • dan815
gotta use calculator
asnaseer
  • asnaseer
|dw:1378196625366:dw|
asnaseer
  • asnaseer
here we see that \(\sin(\theta)=x\) and \(\cos(90-\theta)=x\) which leads to:\[\theta+2(90-\theta)=540/4=135\]\[180-3\theta=135\]\[3\theta=315\]\[\theta=105\]
asnaseer
  • asnaseer
@rajatgang - I hope you can follow the steps
dumbcow
  • dumbcow
typo ^^ theta = 45
asnaseer
  • asnaseer
:)
asnaseer
  • asnaseer
my mistake - thx for spotting @dumbcow
dan815
  • dan815
that was sexy lol
asnaseer
  • asnaseer
lol! thx I guess :)
anonymous
  • anonymous
hey really sory dudes.....it was 3 pi/4....i accept mah mistake.sry
dan815
  • dan815
well you can still use that guys way
anonymous
  • anonymous
hey guys i also solved out dis problem sin^-1x + 2cos^-1x=3 pi/4 sin^-1x + cos^-1x + cos^-1x =3 pi/4 sin^-1x + cos^-1x =pi/2 pi/2 + cos^-1x =3 pi/4 cos^-1x = pi/4 x = 1/root 2
anonymous
  • anonymous
@asnaseer i think your ans is not appropriate bcoz ans is 1/root2
dumbcow
  • dumbcow
you are correct :) @asnaseer is also correct in that solving for the angle...you get 45 in degrees or pi/4 in radians x = sin(pi/4) = 1/root2

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