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*This function gives the cos value of 'iz'.
*This function gives the cos value of 'iz'.
*Where iz is the complex number in the form of "x+iy".i.e.
*Where iz is the complex number in the form of <math>x+iy</math>
*x&y are the real numbers.
*x & y are the real number
*'I' imaginary unit .i=sqrt(-1).
*'i' is the imaginary unit <math>i=sqrt(-1)</math>
*Also x is called the real part & y is the imaginary patr of a complex number.
*Also x is called the real part & y is the imaginary patr of a complex number.
*'COMPLEX' is the function used to convert real& imaginary numbers in to a complex number.
*'COMPLEX' is the function used to convert real& imaginary numbers in to a complex number.