求值:(tan10°-根号3)cos10°÷sin50°

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求值:(tan10°-根号3)cos10°÷sin50°

求值:(tan10°-根号3)cos10°÷sin50°
求值:(tan10°-根号3)cos10°÷sin50°

求值:(tan10°-根号3)cos10°÷sin50°
(tan10°-根号3)cos10°÷sin50°
=(sin10°-根号3cos10°)÷sin50°
=2(1/2sin10°-1/2根号3cos10°)÷sin50°
=-2(sin60°cos10°-cos60°sin10°)÷sin50°
=-2sin50°÷sin50°
=-2

(tan10°-√3)×cos10°/sin50°=(sin10°/cos10°-√3)×cos10°/sin50°=(sin10°-√3cos10°)/sin50°=2(cos60°sin10°-sin60°cos10°)/sin50°=2×sin(10°-60°)/sin50°=-2