“Trigonometry Values Pi/5”的概念、定义、习题解题方法及翻译-数学辞典

单词

Trigonometry Values Pi/5

释义

Trigonometry Values Pi/5

Use the identity

(1)

Now, let

and

. Then

(2)

(3)

Solving the Quadratic Equation for

gives


			(4)

Now,

must be less than

(5)

so taking the Minus Sign and simplifying gives

(6)

can be computed from

(7)

Summarizing,

See also Dodecahedron, Icosahedron, Pentagon, Pentagram

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