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September 20, 2014

September 20, 2014

Posted by **Tara** on Monday, January 11, 2010 at 6:12pm.

For example, 3tan^2x-1 equals the square root of 3 over three. I know 30 degrees is my reference angle. My book says the other answer is 150. But where does this come from? As a general rule, do you find the second angle by subtracting the reference angle from 180 (or 360 if it's that sort of problem)? But this approach doesn't work for the negative sq. root of 2/2=sinx. 360-225 doesn't equal the second angle, 315. So is the way to find the subsequent angles by adding the reference angle (in this case 30) to the degree value of the nearest axis (90, 180, etc)?? Yet this doesn't work for a reference angle of the sq. root +/- 1/2=sinx. One of the answers is 330-270+30 doesn't equal this. Please help clarify this!

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