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How do you solve for all possible solutions between 0 and 360?

(sin(x)^2)-(12sin(x))+2=0

 Oct 16, 2014

Best Answer 

 #1
avatar+118723 
+5

I am just going to outline the answer.  If you have questions then ask.  

 

Let y=sinx  where     $$-1\le y\le1$$

$$y^2-12y+2=0$$

solve using the quadratic formula.

I got 2 answers but only one is within the limits

y= -0.169048

sinx=-0.169048

sin is neg so x is in the 3rd or 4th quads

Find the 1st quad equivalent

inverse sin 0.169048 = 9.73247 degrees

3rd quad angle   x= 180+9.73248 = 189.73248 = 189°43'57"

4th quad angle    x= 360-9.73248 = 350.26752 = 350°16'3"

 Oct 16, 2014
 #1
avatar+118723 
+5
Best Answer

I am just going to outline the answer.  If you have questions then ask.  

 

Let y=sinx  where     $$-1\le y\le1$$

$$y^2-12y+2=0$$

solve using the quadratic formula.

I got 2 answers but only one is within the limits

y= -0.169048

sinx=-0.169048

sin is neg so x is in the 3rd or 4th quads

Find the 1st quad equivalent

inverse sin 0.169048 = 9.73247 degrees

3rd quad angle   x= 180+9.73248 = 189.73248 = 189°43'57"

4th quad angle    x= 360-9.73248 = 350.26752 = 350°16'3"

Melody Oct 16, 2014

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