Changes

*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.