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
asinθ+bcosθ=c --------(1)
bsinθ+acosθ=d --------(2)
(1)^2+(2)^2:
a^2+b^2+4absinθcosθ=c^2+d^2
sin2θ=(c^2+d^2-a^2-b^2)/(2ab)
(1)^2-(2)^2:
(a^2-b^2)((sinθ)^2-(cosθ)^2)=c^2-d^2
cos2θ=-(c^2-d^2)/(a^2-b^2)
(sin2θ)^2+(cos2θ)^2=1
[(c^2+d^2-a^2-b^2)/(2ab)]^2+[(c^2-d^2)/(a^2-b^2)]^2=1
整理后得:
(ac-bd)^2 +(ad-bc)^2=(a^2-b^2)^2

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