Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §7.2 Trigonometric Integrals, #36 · Calculus · Techniques of integration

In 34, the series equals … from … to …, because sines…

In 34, the series equals $- 1$ from $- π$ to $0$ , because sines are odd functions. Sketch the "square wave," which is alternately $- 1$ and $+ 1$ , and find $A$ and $B$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §7.2 Trigonometric Integrals, #36

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