Q.

If the solution of cosec2xdydx-1y=0 is ax + b x + cy2 = k, a > 0 then ascending order of a,b,c is

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a

a,b,c

b

c,b,a

c

c,a,b

d

b,a,c

answer is B.

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Detailed Solution

cosec2xdydx-1y=0  cosec2x dydx=1y  y dy=1cosec2x dx  y dy=sin2 x dx       y dy=(1-cos2x)2dx

  y22=12x-sin2x2  2y2=2x-sin2x+2c  2c=2x-sin2x-2y2K=ax+b sin2x+cy2 K=2c, a=2, b=-1, c=-2     c<b<a  c, b, a

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