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If the equation of a curve C is transfor...

If the equation of a curve C is transformed to `9x^(2) +25y^(2) = 225` be the rotation of the coordinate axes about the origin through an angle `(pi)/(4)` in the positive direction then the equation of the curve C, before the transformation is

A

`17x^(2) +16xy+17y^(2) = 225`

B

`17x^(2) +23y^(2) = 391`

C

`17x^(2) - 16xy +17y^(2) = 225`

D

`23x^(2) +17y^(2) = 391`

Text Solution

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The correct Answer is:
C
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TS EAMCET PREVIOUS YEAR PAPERS-AP EAMCET ENGINEERING ENTRANCE EXAM ONLINE QUESTION PAPER 2019 (SOLVED)-Mathematics
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