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      <text>6.2.2.3 Key point</text>
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<h4>Key Point: </h4>
<p>The fundamental identity relating hyperbolic functions is:</p>
<p style="text-align: center;">\(\rm cosh^2 x - \sinh^2 x \equiv 1\)</p>
<p>This is the hyperbolic function equivalent of the trigonometric identity: \( \cos^2x + \sin^2 x \equiv 1 \)</p>
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