Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §10.1 The Geometric Series, #6 · Calculus · Series

Multiply the series … and find the product by comparing with equation…

Multiply the series $(1 + x + x^{2} + \dots) (1 - x + x^{2} - \dots)$ and find the product by comparing with equation (14).

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §10.1 The Geometric Series, #6

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