CCS/TMS320F28069M: Using sin and cosin function the output results are not proper

#include "DSP28x_Project.h"     // Device Headerfile and Examples Include File
#include <stdio.h>
#include <math.h>
#include <cmath>
#define pi 3.14159265358979323846
// Prototype statements for functions found within this file.
interrupt void adc_isr(void);
void Adc_Config(void);


// Global variables used in this example:
Uint16 LoopCount;
Uint16 ConversionCount;
Uint16 Voltage1[10];
Uint16 Voltage2[10];

int i=0,j=0,l=0,m=0,b=0,d=0;

float num=0,rmsv1=0,rmsv2=0,V1[25]={0},V2[25]={0},sumv1=0,sumv2=0,V1s[25]={0},V1c[25]={0},V2s[25]={0},V2c[25]={0},sumv1s=0,sumv1c=0,sumv2s=0,sumv2c=0,v1ph=0,v2ph=0,k=0,a=0, b1=0, o=1.57,p=0;


main()
{

   InitSysCtrl();

   DINT;

   InitPieCtrl();

// Disable CPU interrupts and clear all CPU interrupt flags:
   IER = 0x0000;
   IFR = 0x0000;

   InitPieVectTable();

   EALLOW;  // This is needed to write to EALLOW protected register
   PieVectTable.ADCINT1 = &adc_isr;
   EDIS;    // This is needed to disable write to EALLOW protected registers


   InitAdc();  // For this example, init the ADC

   PieCtrlRegs.PIEIER1.bit.INTx1 = 1;	// Enable INT 1.1 in the PIE
   IER |= M_INT1; 						// Enable CPU Interrupt 1
   EINT;          						// Enable Global interrupt INTM
   ERTM;          						// Enable Global realtime interrupt DBGM

   LoopCount = 0;
   ConversionCount = 0;

// Configure ADC
	EALLOW;

    	AdcRegs.ADCCTL2.bit.ADCNONOVERLAP = 1;	// Enable non-overlap mode
    	AdcRegs.INTSEL1N2.bit.INT1E     = 1;		//Enabled ADCINT1
    	AdcRegs.INTSEL1N2.bit.INT1CONT  = 0;		//Disable ADCINT1 Continuous mode
    	AdcRegs.INTSEL1N2.bit.INT1SEL	= 1;		//setup EOC1 to trigger ADCINT1 to fire
    	AdcRegs.ADCSOC0CTL.bit.CHSEL 	= 0;		//set SOC0 channel select to ADCINA0
    	AdcRegs.ADCSOC1CTL.bit.CHSEL 	= 1;		//set SOC1 channel select to ADCINA1

    	AdcRegs.ADCSOC0CTL.bit.TRIGSEL 	= 5;		//set SOC0 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1
    	AdcRegs.ADCSOC1CTL.bit.TRIGSEL 	= 5;		//set SOC1 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1

    	AdcRegs.ADCSOC0CTL.bit.ACQPS 	= 6;
    	AdcRegs.ADCSOC1CTL.bit.ACQPS 	= 6;		//set SOC0 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)


    	GpioCtrlRegs.GPACTRL.all  = 0x00000000;
    	GpioCtrlRegs.GPAQSEL1.all = 0x55555555;
    	GpioCtrlRegs.GPAMUX1.all  = 0x00000000;  // All GPIO
    	GpioCtrlRegs.GPADIR.all   = 0xFFFFFFFF;   // All outputs
    	GpioCtrlRegs.GPAPUD.all   = 0x00000000;   // Enable pull-up on GPIO2

	EDIS;

// Assumes ePWM1 clock is already enabled in InitSysCtrl();
   EPwm1Regs.ETSEL.bit.SOCAEN	= 1;		// Enable SOC on A group
   EPwm1Regs.ETSEL.bit.SOCBEN	= 1;
   EPwm1Regs.ETSEL.bit.SOCASEL	= 4;		// Select SOC from CMPA on upcount
   EPwm1Regs.ETPS.bit.SOCAPRD 	= 1;		// Generate pulse on 1st event
   EPwm1Regs.CMPA.half.CMPA 	= 0x0080;	// Set compare A value
   EPwm1Regs.TBPRD 				= 0x7530;	// Set period for ePWM1
   EPwm1Regs.TBCTL.bit.CTRMODE 	= 0;		// count up and start

// Wait for ADC interrupt

   for(;;)
   {
      LoopCount++;
   }

}

interrupt void  adc_isr(void)
{

		b++;
		GpioDataRegs.GPADAT.all  = 0x0000000C;			//output pulse GPIO2 and GPIO3 high

		for (i = 0; i < 30 ; i++) {}

		GpioDataRegs.GPATOGGLE.all  = 0x0000000F;		//Toggle output bits

		o=1.78;
		p= sqrt(129);

		b1 = sin(pi/2);
		k = cos(pi/2);
		a =k*k+(b1*b1);

  AdcRegs.ADCINTFLGCLR.bit.ADCINT1 = 1;		//Clear ADCINT1 flag reinitialize for next SOC
  PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;   // Acknowledge interrupt to PIE

  return;
}