8sinπ/48*cosπ/48cosπ/24cosπ/12=

fishmoney2022-10-04 11:39:542条回答

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le69215 共回答了21个问题 | 采纳率85.7%: 倍角公式
8sinπ/48*cosπ/48cosπ/24cosπ/12
=4sin(π/24)cos(π/24)cos(π/12)
=2sin(π/12)cos(π/12)
=sin(π/6)
=1/2; 1年前

桃灼灼共回答了9个问题 | 采纳率: 原式=4*（2sinπ/48*cosπ/48）cosπ/24cosπ/12
=4sinπ/24cosπ/24cosπ/12
=2*(2sinπ/24cosπ/24)cosπ/12
=2sinπ/12cosπ/12
=sinπ/6
=1/2
知识点：sin2a=2sinacosa 正弦的倍角公式; 1年前

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8sin π/48*cosπ/48*cosπ/24*cosπ/12=? 8sin π/48*cosπ/48*cosπ/24*cosπ/12=? 8sin π/48 * cos π/48 * cos π/24 * cos π/12=? 你知道我的迷茫1年前1: internetdong 共回答了14个问题 | 采纳率85.7%

8sinπ/48*cosπ/48*cosπ/24*cosπ/12=4sinπ/24*cosπ/24*cosπ/12=2sinπ/12*cosπ/12=sinπ/6=1/2

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