“trigonometric substitutions”的概念、定义、翻译、参考文献-科学参考

单词	trigonometric substitutions
释义	trigonometric substitutions [¦trig·ǝ·nǝ¦me·trik ´sǝb·stǝ`tü·shǝnz] ^MATHEMATICS The substitutions x = a sin u, x = a tan u, and x = a sec u, which are used to rationalize expressions of the form √(a² - x²), √(x² + a²), and √(x² - a²), respectively, when they appear in integrals.
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