# Math Help - Sinh and Skn

1. ## Sinh and Sin

Solve in R : $\sin x = \sinh (2x - 3) - 1
$

2. There is a solution between 2 and 3.

3. Originally Posted by red_dog
There is a solution between 2 and 3.
It is also unique as the derivative of $\sinh(2x-3)-\sin(x)-1$ is always positive.

(root $\approx 2.180$)

CB

4. dhiab, we can rewrite it this way,

.

exponentially,
,

by successive approximation, x = 2.18

dhiab, is this what you need?