The sine maps bijectively onto the upper half-plane: its imaginary part is , and the equality of two sine values forces either equal arguments modulo or arguments summing to an odd multiple of . Only equality is possible in this domain. For surjectivity, solve for . When , exactly one root has modulus below one and it has positive real part. The inverse therefore belongs to the half-strip. Composing with gives a conformal map onto the unit disc.
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