Sinh(x) * sin(x) and sinh(x) * cos(x)

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flufypancakes
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anyone knows what's sinh(x)*sin(x)? or sinh(x)*cos(x)?

i get sinh(x)sin(x) = 1/2[cos(x[i-1]) + cos(x[i+1])], but that doesn't help me much. any suggestions?
 

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