what does sinh do? how do I get inverse sin? i.e. how do I push buttons to get an angle in degrees from the ratio of triangle side lengths? same question for cos and tan buttons

Guest Apr 7, 2017

#3**0 **

If you have a right-angled triangle and the opposite side length (= b, say) and the length of the hypotenuse (= h, say)

then the angle ( = B) is given by 2nd asin (b/h) enter

If you have the adjacent side length (= a, say) and the hypotenuse

then B is given by 2nd acos (a/h) enter

If you have the opposite and adjacent side lengths

then B is given by 2nd atan (b/a) enter

"sinh" is what is known as a hyperbolic function. It is defined as follows:

sinh(x) = (e^{x} - e^{-x})/2

We also have cosh(x) = (e^{x} + e^{-x})/2

and tanh(x) = sinh(x)/cosh(x)

..

Alan
Apr 7, 2017