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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §1.5 A Review of Trigonometry, #4 · Trigonometry · Identities

Show that … and … have period … and draw them on…

Show that $cos 2 θ$ and $cos^{2} θ$ have period $π$ and draw them on the same graph.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §1.5 A Review of Trigonometry, #4

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