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MODULE functions
CONTAINS
FUNCTION my_exp(x) result(y)
real(kind=8), intent(in) :: x
real(kind=8) :: y
y = exp(x)
END FUNCTION my_exp
FUNCTION my_sin(x) result(y)
real(kind=8), intent(in) :: x
real(kind=8) :: y
y = sin(x)
END FUNCTION my_sin
FUNCTION my_poly(x) result(y)
real(kind=8), intent(in) :: x
real(kind=8) :: y
!! for the task some polynomial of order 10 should be tested...
!! so to have a simple equation I chose Chebyshev polynomial
y = cos(10 * acos(x))
END FUNCTION my_poly
END MODULE functions
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