Charley Brians was playing around with the following 6 trigonometric functions:

- \(\sin\)
- \(\cos\)
- \(\tan\)
- \(\cot\)
- \(\sec\)
- \(\csc\).

He noticed that, for one of them, if he sets it equal to its hyperbolic counterpart--sinh, cosh, tanh, coth, sech, or csch, respectively--it intersects at exactly four points.

Which trig function did he pick?

**Assumption**: We are only dealing with real numbers.

Inspiration: Brian Charlesworth

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