已知m^2+2n+2p^2-2mn-2np-6p+9=0,求【(n^2)p】/m的值
2个回答
sina=-1/2
又 sin²a+cos²a=1
从而 cosa=±√3/2
∴原式=1/cos(a-7π)=1/(-cosa)=±2√3/3
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