(tan10°-根號3)cos10°÷sin50°
=(sin10°-根號3cos10°)÷sin50°
=2(1/2sin10°-1/2根號3cos10°)÷sin50°
=-2(sin60°cos10°-cos60°sin10°)÷sin50°
=-2sin50°÷sin50°
=-2據(jù)說不對啊。。誰敢說不對?。?div style="margin-top:20px">
求值:(tan10°-根號3)cos10°÷sin50°
求值:(tan10°-根號3)cos10°÷sin50°
數(shù)學(xué)人氣:136 ℃時間:2019-08-22 20:37:29
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