# Using trignometric functions

**URL:** <https://forum.sierrawireless.com/t/using-trignometric-functions/3101>\
**Category:** Legacy AirPrime modules\
**Created:** [April 4, 2009, 6:23am UTC](https://forum.sierrawireless.com/t/using-trignometric-functions/3101 "2009-04-04T06:23:38Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![suma](https://avatars.discourse-cdn.com/v4/letter/s/22d042/32.png) [@suma](https://forum.sierrawireless.com/u/suma)\
**Post date:** [April 4, 2009, 6:23am UTC](https://forum.sierrawireless.com/t/using-trignometric-functions/3101/1 "2009-04-04T06:23:38Z")

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hi,

```
      I am working on wireless cpu Q2686,Using os version 6.01.07,firm ware R71,compiler GCC, IDE eclipse 3.2.2.
      In my application iam using trignometric functions, when i want to display the value of any trignometric functions
      after building target it gives "undefined reference to sin" . If i want to use the value of any trignometric function in 
      another trignometric function it is giving the same error.

      i added the statement in open AT project wizard in wm newscript additional options 
     " -extlib C:\OpenAT\IDE\GCC\4.0.1.1\arm-elf\lib\thumb\interwork -libname libm.a "

      can anybody help me with this issue

```

regards

Suma.S  
[suma@tovyaautomation.com](mailto:suma@tovyaautomation.com)

---

<div class="post-metadata">

**Author:** ![Jonathan](https://avatars.discourse-cdn.com/v4/letter/j/aeb1de/32.png) [@Jonathan](https://forum.sierrawireless.com/u/Jonathan)\
**Post date:** [September 25, 2009, 12:04pm UTC](https://forum.sierrawireless.com/t/using-trignometric-functions/3101/2 "2009-09-25T12:04:26Z")

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Hi, to add a external library to your OAT App, the firts step is that you made and the second is:

Find the make file of yor project and add handly in EXTERNAL\_LIB\_LIST like this

#------------------------------------------------------------------------------

# List of libraries real names to use for making binary file

#------------------------------------------------------------------------------  
EXTERNAL\_LIB\_LIST =   
/cygdrive/C/OpenAT/IDE/GCC/4.0.1.2/arm-elf/lib/thumb/interwork/libm.a \

Bye