No, sinh is a hyperbolic function of the sine. Sin^-1 is the opposite of sine. You use inversion to find angles.
The hyperbolic trigonometric functions are defined by. sinh(t) = et − e−t 2 , cosh(t) = et + e−t 2 . (They usually rhyme with “pinch” and “posh”.) As you can see, sinh is an odd function and cosh is an even function. Also, cosh is always positive and actually always greater than or equal to 1.
SINH(x) returns the hyperbolic sine of angle x. The argument x must be expressed in radians. To convert degrees to radians, use the RADIANS function.
The TI-Basic Information Repository
Takes the hyperbolic cosine of a number. Press 2nd MATH to bring up the MATH menu. Press C to bring up the Hyperbolic submenu. Press 2 to select cosh(.
Hyperbolic sine function
The hyperbolic sine function is a function f: R → R is defined by f(x) = [ex– e –< /sup>x]/2 and is denoted by sinh x. Sinh x = [ex– e–x]/2. Diagram: y = Sinh x.
The hyperbolic sine function sinhx is one-to-one and therefore has a well-defined inverse sinh−1x, which is shown in blue in the figure. However, to invert the hyperbolic cosine function (as with the square root) we need to constrain its domain.
The hyperbolic sine and cosine are given as follows: cosh a = e a + e − a 2 , sinh a = e a − e − a 2 .