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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

c,a,b

b

b,a,c

c

a,b,c

d

c,b,a

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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