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- #include <stdio.h>
- #include <math.h>
- main( )
- {
- float a1,a2,a3;
- float b1,b2,b3;
- float theta;
- a1 = 1;
- a2 = 0;
- a3 = 0;
- b1 = 0;
- b2 = 1;
- b3 = 0;
- theta = (a1*b1+a2*b2+a3*b3)/sqrt(a1*a1+a2*a2+a3*a3)/sqrt(b1*b1+b2*b2+b3*b3);
- printf( " theta = %f\n ",theta);
- }
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