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CCS/TMS320F28335: IQ math library error

Part Number: TMS320F28335
Other Parts Discussed in Thread: MATHLIB

Tool/software: Code Composer Studio

The following code is from the IQ math document. I am getting this error while compiling in ccs. 

#include<IQmathLib.h>
#define PI 3.14159
_iq input, sin_out;
void main(void )
{
/* 0.25 x PI radians represented in Q29 format */
input=_IQ29(0.25*PI);
sin_out =_IQ29sin(input);
}


Console is showing like this.

undefined first referenced
symbol in file
--------- ----------------
__IQ29sin ./main.obj

error #10234-D: unresolved symbols remain
error #10010: errors encountered during linking; "math_example.out" not built

>> Compilation failure
makefile:141: recipe for target 'math_example.out' failed
gmake[1]: *** [math_example.out] Error 1
makefile:137: recipe for target 'all' failed
gmake: *** [all] Error 2