Last Updated
：2025/11/29
Pythagorean trigonometric identity
Noun
Japanese Meaning
単位円上におけるピタゴラスの定理の応用として、任意の実数および複素数 x に対して sin²(x) + cos²(x) = 1 が成立する三角恒等式
（ plural ）
Quizzes for review
(trigonometry) The equality sin (x)²+ cos (x)²=1, holding for all real and complex x, equivalent to the application of the Pythagorean theorem to the unit circle.
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Pythagorean trigonometric identity
Every time I teach calculus, I remind students that the Pythagorean trigonometric identity underlies many simplifications.
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Every time I teach calculus, I remind students that the Pythagorean trigonometric identity underlies many simplifications.
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