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//Given that
r = [2,2,2*sqrt(2)]
// sample Problem 2a Page No. 176
printf("\n \n\n # Problem 2a # \n")
r_magnitude = sqrt ( 2^2 + 2^2 + (2*sqrt(2))^2)
cos_x = ( 2 / r_magnitude)
cos_y = ( 2 / r_magnitude)
cos_z = ( 2.8284 / r_magnitude)
printf(" \n Directional cosine in X - axis is %f ", cos_x)
printf(" \n Directional cosine in Y - axis is %f " ,cos_y)
printf(" \n Directional cosine in Z - axis is %f ", cos_z)
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