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

click 2nd then the trigonometric ratios.

Davis  Apr 7, 2017

i am confused on dis 2

Guest Apr 7, 2017

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) = (ex - e-x)/2


We also have cosh(x) = (ex + e-x)/2


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


Alan  Apr 7, 2017
edited by Alan  Apr 7, 2017

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