"f(x)=6\\frac{e^{2x}+e^{-2x}}{2} +10\\frac{e^{2x}-e^{-2x}}{2}-65=3e^{2x}+3e^{-2x}+5e^{2x}-5e^{-2x}-65=8e^{2x}-2e^{-2x}-65"
"f'(x)=16e^{2x}+4e^{-2x}"
f'(x)>0 - There is no stationary points and points of inflexion
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