Exercises 8386 refer to Figure 19. Length QR is called the subtangent at P, and length RT
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Exercises 83–86 refer to Figure 19. Length QR is called the subtangent at P, and length RT is called the subnormal.
Prove in general that the subnormal at P is |ƒ'(x) ƒ(x)|.
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y Q P=(x, f(x)) R y=f(x) Tangent line T -X
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