prove that ( cosh2x-1)/2 = sinhx
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Step-by-step explanation:
( cosh2x-1/2) =(e^x + e^-x/2)² - ( e^x - e^-x/2)²
=e^2x+ 2 + e^-2x -e ^2x+2 -e^-2x/4
=4/4
=1
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