如图,在直角坐标系中,已知点A(x1,-3)在第三象限,点B(X2,-1)在第四象限,线段A B与y轴交于点D,且∠AOB=90°1 当x2=1,求直线AB的解析式2 当△AOB的面积等于9时,设∠AOD=α,求sinα*cosα的值.
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![如图,在直角坐标系中,已知点A(x1,-3)在第三象限,点B(X2,-1)在第四象限,线段A B与y轴交于点D,且∠AOB=90°1 当x2=1,求直线AB的解析式2 当△AOB的面积等于9时,设∠AOD=α,求sinα*cosα的值.](/uploads/image/z/12417496-16-6.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BB%E4%B8%AD%2C%E5%B7%B2%E7%9F%A5%E7%82%B9A%28x1%2C-3%29%E5%9C%A8%E7%AC%AC%E4%B8%89%E8%B1%A1%E9%99%90%2C%E7%82%B9B%28X2%2C-1%29%E5%9C%A8%E7%AC%AC%E5%9B%9B%E8%B1%A1%E9%99%90%2C%E7%BA%BF%E6%AE%B5A+B%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9D%2C%E4%B8%94%E2%88%A0AOB%3D90%C2%B01+%E5%BD%93x2%3D1%2C%E6%B1%82%E7%9B%B4%E7%BA%BFAB%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F2+%E5%BD%93%E2%96%B3AOB%E7%9A%84%E9%9D%A2%E7%A7%AF%E7%AD%89%E4%BA%8E9%E6%97%B6%2C%E8%AE%BE%E2%88%A0AOD%3D%CE%B1%2C%E6%B1%82sin%CE%B1%2Acos%CE%B1%E7%9A%84%E5%80%BC.)
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