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. The majority of the ou's undergraduate students are based throughout the united kingdom and pr…
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因为任一角度都可以表示为 k π 2 + α (k ∈ z) , | α | <π 4, 1.
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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