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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.故答案為:…
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