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The coordinate axes are rotated through ...

The coordinate axes are rotated through an angle `theta` about the origin in anticlockwise sense. If the equation `2x^(2)+3xy-6x+2y-4=0` change to `ax^(2)+2hxy+by^(2)+2g x+2fy+c=0` then `a+b` is equal to

A

1)`3 cos theta -3sin theta`

B

2)`3 cos theta +2sin theta`

C

3)1

D

4)2

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The correct Answer is:
D
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