Correct layout of e^/LN/10^/LOG?

[dm319]

(10-24-2024 10:28 PM)naddy Wrote:  A tangentially related issue is the inclusion, or lack thereof, of the hyperbolic functions:

Ok now is as good a time as any to ask how did we decide on sin, cos and tan? Why not sec, sin and tan (and co-sec, cosine and cot on shifted functions?). Is it simply that cos/sin/tan are more useful? Actually I don't even know what the 'co' means come to think of it.