Earliest handheld / battery calculator with hyperbolics?

[Gene]

Sharp calculator with Hyperbolics from 19740407

1974, April 4th ad from a NJ newspaper.

Sharp ? Don't recognize the model.

Which model is this? Looks like the PC-1801 or PC-1802, but those did not have hyperbolics.

Any earlier model with sinh, cosh, tanh built-in?

April 1974 seems pretty early. :-)

It could of course be a typo in the advertisement, but that would seem to imply hyperbolic functions would have been somewhat known at the time.

?