新版高中数学人教A版必修4习题：第一章三角函数 1-3-2 含解析-2019最新整理

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新版高中数学人教A版必修4习题：第一章三角函数 1-3-2 含解

析-2019最新整理

课时过关·能力提升 基础巩固

1已知sin αA

解析:coα=答案:C

2已知siA.-解

析:siα∈sinα=tanα

答案:A

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3若sin(3π+α)=A.

解析:由已知,得sinα

则coα=答案:A

4化简sin 95°+cos 175°= .

解析:sin95°+cos175°=sin(90°+5°)+cos(180°-5°)=cos5°-cos5°=0. 答案:0

5已知si解析:∵si

∴si答案:

6化

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解析:原

=答案:-1

7求证

证明左,故原等式成立.

8已知角α的终边经过点P(-4,3),解∵角α的终边经过点P(-4,3),

∴tanα∴原α=

9已知sin α解∵sinαα=

∴tanα∴原式=tanα

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