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3-Visitor

## Trigonometry

Hello,

Right, mathcad and trig do not seem to be living a harmonious lifestyle. I ask why?

I'm going through some fairly basic questions for an assignment for school and again on paper everything is rosy, but then mathcad is unconvinced.

I am seeming unable to input the inverse trig functions in any form which I know (sin^-1, asin) and then as you can see in question 8 in the file attached the answer is absolutely wrong.

What's the issue?! Is it me? Admittedly quite possible but I think I have tried all of the obvious approaches but I am likely wrong.

thank you in advance for any help which you can offer me!

Rowan

1 ACCEPTED SOLUTION

Accepted Solutions
14-Alexandrite
(To:StuartBruff)

In addition to Stuart's excellent reply, you should consider using units wherever possible to eliminate conversion errors.  Prime 7 and PDF attached. (hope my high school trig is OK)

4 REPLIES 4
23-Emerald II
(To:RG_10050841)

@RG_10050841 wrote:

Hello,

Right, mathcad and trig do not seem to be living a harmonious lifestyle. I ask why?

I'm going through some fairly basic questions for an assignment for school and again on paper everything is rosy, but then mathcad is unconvinced.

I am seeming unable to input the inverse trig functions in any form which I know (sin^-1, asin) and then as you can see in question 8 in the file attached the answer is absolutely wrong.

What's the issue?! Is it me? Admittedly quite possible but I think I have tried all of the obvious approaches but I am likely wrong.

Mathcad trig functions expect angles to be in radians.   Fortunately, you can tell Mathcad you mean degrees by simply adding the "deg" unit after your angles' numeric values.

Stuart

23-Emerald II
(To:StuartBruff)

You need to type in "deg" whenever you need the answer in degrees.  Mathcad does not remember what you want.  If you don't, then you'll get the answer in radians; for example:

If you're not sure of the name of the unit you require, then Mathcad provides a helpful list in the Units tab of the Math ribbon

Stuart

14-Alexandrite
(To:StuartBruff)

In addition to Stuart's excellent reply, you should consider using units wherever possible to eliminate conversion errors.  Prime 7 and PDF attached. (hope my high school trig is OK)

17-Peridot
(To:RG_10050841)

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