当 k 是偶数时,得到 α 的同名函数值,即函数名不改变; 2. Ou组合发音顺口溜: ①、 [au] ou组合:cloudy多云的 house房子 mouse老鼠about大约mouth嘴 blouse女式衬衫 mountain大山 ②、 [au ] ow组合:cow母牛 how怎样,多少 now现在 brown. 因为任一角度都可以表示为 k π 2 + α (k ∈ z) , | α | <π 4, 1.
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当 k 是奇数时,得角 α 的 异名函数值, 即 s i n → c o s;
1、汉语拼音的o不读“欧”,而是“哦”。“欧”是前响双元音ou( [oʊ]),从 半闭后圆唇元音 [o] 过渡到 次闭次后圆唇元音 [ʊ],以 [o]为主;“哦”是单元音 [o̞],介于 半闭后圆唇元音 [o] 和 半开后圆唇.
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