Mathematics, 29.07.2020 15:01, alexandrecarmene

2 cos 30 ° cos 20 ° − 2 cos 40 ° sin 10 ° − 2 cos 20 ° sin 10 ° 2 cos ⁡ 30 ° cos ⁡ 20 ° - 2 cos ⁡ 40 ° sin ⁡ 10 ° - 2 cos ⁡ 20 ° sin ⁡ 10 ° =?

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2 cos 30 ° cos 20 ° − 2 cos 40 ° sin 10 ° − 2 cos 20 ° sin 10 ° 2 cos ⁡ 30 ° cos ⁡ 20 ° - 2 cos ⁡ 40...

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