已知asinθ+bcosθ=c,bsinθ+acosθ=d,求证:(ac-bd)²+(ad-bc)²=(a²-b²)²
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已知asinθ+bcosθ=c,bsinθ+acosθ=d,求证:(ac-bd)²+(ad-bc)²=(a²-b²)²已知asinθ+bcosθ=c,b
已知asinθ+bcosθ=c,bsinθ+acosθ=d,求证:(ac-bd)²+(ad-bc)²=(a²-b²)²
已知asinθ+bcosθ=c,bsinθ+acosθ=d,求证:(ac-bd)²+(ad-bc)²=(a²-b²)²
已知asinθ+bcosθ=c,bsinθ+acosθ=d,求证:(ac-bd)²+(ad-bc)²=(a²-b²)²
很容易的
把sinθ和cosθ看成未知数,解原方程组,得
cosθ=(ad-bc)/(a²-b²)
sinθ=(ac-bd)/(a²-b²)
把这两个代入
sin²θ+cos²θ=1
即可得
(ac-bd)²+(ad-bc)²=(a²-b²)²
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