y=cot-1(-.92170128)

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- August 23rd 2008, 06:04 PMneeInverse Circular Function, help!!!
y=cot

**-**1(-.92170128)

- August 23rd 2008, 06:14 PMSpec
What's the question exactly?

- August 23rd 2008, 06:24 PMnee
According to the text the answer should come up to

**2.3154725**in radian mode.

The text states: "We take the inverse tangent of the reciprocal to find the inverse cotangent".

I therefore punch in:

tan-1(1/-0.92170128)

like the examples show me but I get:

-0.826120119 - August 23rd 2008, 06:39 PMSpec
You were using the correct method:

The book's answer is

I should probably mention that they've given this answer because arccotangent's range is - August 23rd 2008, 06:43 PMnee
OK I just fugured it out:

In degree mode I punched in:

tan-1(1/-0.92170128)

= -47.33319621

-47.33319621 + 180 (which is ∏ radians)

= 132.6668038

132.6668038/180

= 0.737037799

0.737037799 x ∏

= 2.31572534

but I can't fugure out how to get the answer strait into radians? - August 23rd 2008, 06:45 PMnee
Oh ok. Thanks Spec, I was almost there.

nee