4cos50°-tan40°=______ ．

4cos50 ° - tan40 ° = 4sin40 ° - tan40 ° = 4sin40 ° cos40 °− sin40 ° cos40 ° = 2sin80 ° − sin (30 ° + 10 °) cos40 ° = 2cos10 ° − 12cos10 ° − 32sin10 ° cos40 ° = 32cos10 ° − 32sin10 ° cos40 ° = 3cos (30 ° + 10 °) cos40 ° = 3

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