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BB_1410064610-Marble
10-Marble
October 7, 2025
Solved

Solve variable inside of trig equation?

  • October 7, 2025
  • 1 reply
  • 300 views

I'm using MathCAD 9.0.0.0. How can I use MathCAD to solve for theta? Below is the screen capture of what I have written so far. Attached is my MathCAD file.

BB_14100646_0-1759859870063.png

 

Thanks,

        Brent

 

Best answer by terryhendicott

Hi Brent.

You could do it this way:-

Capture.JPG

Prime 9 worksheet enclosed

Cheers

Terry

1 reply

W
Werner_E25-Diamond I
25-Diamond I
October 7, 2025

To input an equation you hat to use the Boolean/comparison equal.

 

To get the desired solution I would suggest that you use one of Primes numeric methods.

You can use the "root" function by providing the interval from 0 to pi

Werner_E_0-1759869042652.png

Or you can use the "root" function by providing an appropriate guess value

Werner_E_1-1759869098417.png

Another option is using a solve block with "find". Its ugly looking and takes up much space, but here you have the option to add additional constraints

Werner_E_2-1759869170676.png

 

You may also use the symbolic engine with "solve", but as you are just looking for a numeric value I would not suggest doing so.

Werner_E_3-1759869257840.png

Prime 9 sheet attached

 

    T
    21-Topaz II
    terryhendicott21-Topaz IIAnswer
    21-Topaz II
    October 8, 2025

    Hi Brent.

    You could do it this way:-

    Capture.JPG

    Prime 9 worksheet enclosed

    Cheers

    Terry

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