摘要：From our first identity sin²θ+cos²θ≡1, we have two new identities.Make sure you are happy with the following topics before contin
From our first identity sin²θ+cos²θ≡1, we have two new identities.
Make sure you are happy with the following topics before continuing.
Basic Trig IdentitiesReciprocal Trig Functions来源：安娜说留学
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