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By substituting jA and jB for and o respectively in the trigonometric identity for cose-cos, show that cosh A-cosh B A+BY nh(-2) sinh (-z8)

By substituting jA and jB for and o respectively in the trigonometric identity for cose-cos, show that cosh A-cosh B A+BY nh(-2) sinh (-z8) (^= B) =2sinh

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