3. Show that cos 30 = cos 0 – 3 cos 0. [Hint: Apply De Moivre's Theorem.] |

Calculus: Early Transcendentals
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Author:James Stewart
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Chapter1: Functions And Models
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Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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3. Show that cos 30 = cos³ 0 – 3 cos 0. [Hint: Apply De Moivre's Theorem.]
Transcribed Image Text:3. Show that cos 30 = cos³ 0 – 3 cos 0. [Hint: Apply De Moivre's Theorem.]
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