(cos^2 10°-cos^2 80°)+sin^2 20°
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/16 08:11:57
(cos^2 10°-cos^2 80°)+sin^2 20°
![(cos^2 10°-cos^2 80°)+sin^2 20°](/uploads/image/z/7831105-25-5.jpg?t=%28cos%5E2+10%C2%B0-cos%5E2+80%C2%B0%29%2Bsin%5E2+20%C2%B0)
(cos^2 10°-cos^2 80°)²+sin^2 20°
=(cos^2 10°-sin^2 10°)²+sin^2 20°
=cos²20+sin²20°
=1
=(cos^2 10°-sin^2 10°)²+sin^2 20°
=cos²20+sin²20°
=1
(cos^2 10°-cos^2 80°)+sin^2 20°
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