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July 23, 2014

July 23, 2014

Posted by **kenji86** on Friday, April 9, 2010 at 5:01am.

- math -
**Reiny**, Friday, April 9, 2010 at 8:20amThe arcsin(x), arcsos(x), and arctan(x) functions on a calculator have been designed and programmed to give you the nearest angle to zero.

So if x > 0, no problem, you get the angle in the first quadrant, but if x< 0 both the arcsin and the arctan will give you the negative angle closest to zero.

BTW, to get the arcsin differs from one calculator to another, on mine to do the above I do ..

2nd F

sin

.4

±

=

and get -23.578...

so to get the correct angles I have to know the CAST rule, that is, I have to know where the different trig functions are positive and negative.

I know the sine is negative in III and IV

for III : angle = 180° + |-23.578| = 204.578°

for IV : angle = 360° - |-23.578| = 335.422°

- math -
**kenji86**, Sunday, April 11, 2010 at 9:47amwhy exponential model would be more suitable than a linear model. Thanks.

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