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cos(i) = cosh(1) = approximated 1.54 , because cos(i) = cosh(-i^2) or cos(i) = cosh(i^4) alternative that cos(i) = 1/sec(i) (transitive axiom) (1 + e^2)/2e property: cosh(1) is a transcendental number i therefore conclude that in terms of decimal expression the answer is approximated 1.54 (vote up)