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symbolipoint

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I have been hoping to find and SEE the values of a, b, and c in their right triangle for a hyperbola, but I just cannot find this triangle. I have looked in a couple of College Algebra textbooks, and the most that is done is to assign a substitution as part of the derivation of the equation for the hyperbola. That just does not help to show where to find the right triangle. [tex]a^2+b^2=c^2[/tex] comes simply from the part of [tex]c^2-a^2[/tex]

but no picture to support it.