Q.

The angle of rotation of the axes so that the equation ax + by + c = 0  may be reduced to  X = p is

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a

tan−1ba

b

tan−1ab

c

π2

d

π3

answer is A.

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Detailed Solution

a(Xcosθ−Ysinθ)+b(Xsinθ+Ycosθ)+c=0coefficient of Y = 0
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