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How do you verify ##tanh x/(cosh x - sinh x tanh x) = sinh x##?
see below
Left Side: ##=(sinhx/coshx)/(coshx-(sinhx*sinhx/coshx)##
##=(sinhx/coshx)/(coshx-sinh^2x/(coshx))##
##=(sinhx/coshx)/((cosh^2x-sinh^2x)/(coshx))##
##=sinhx/coshx * coshx/(cosh^2x-sinh^2x)##
##=sinhx/(cosh^2x-sinh^2x)##
##=sinhx/1##
##=sinhx##
##=## Right Side