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1 Elementary Functions - Elsevier.com · 2013. 12. 20. · 3. cos2 x−sin2 y =cos(x+y)cos(x−y) = cos2 y −sin2 x 4. sinh2 x+cosh2 y =cosh(x+y)cosh(x−y)=cosh2 x+sinh2 y 1.316
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