## Calculus 8th Edition

$\sinh(-x) = -\sinh(x)$
Since, we have formula for $\sinh(x) = \dfrac{e^{x} - e^{-x}}{2}$ Thus, $\sinh(-x) = \dfrac{e^{-x} - e^{-(-x)}}{2}=\dfrac{e^{-x} - e^{-x}}{2}$ or, $= \dfrac{-(e^{x} - e^{-x})}{2}$ or, $= -\sinh(x)$