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Question

The equation 2xy=9 is transformed to x2y2=9 by rotating the axes through an angle π4. Is this statement true or false?

A
True
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B
False
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Solution

The correct option is A True
2(xcosπ4ysinπ4)(xsinπ4+ycosπ4)=9
or 2.xy2.x+y2=0 or x2y2=9

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