A-level数学:基本三角恒等式。Basic Trig Identities We’ve still got one or two more rules to know… These ones relate sin, cos and - Overseas Math于20241115发布在抖音,已经收获了5个喜欢,来抖音,记录美好生活!
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Basic and Pythagorean Identities Notice how a "co-(something)" trig ratio is always the reciprocal of some "non-co" ratio. You can use this fact to help you keep straight that cosecant goes with sine and secant goes with cosine.
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