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Q.

 Column - 1 Column - 2
A)Let  f(x)  be a non-constant thrice differential function defined on  (,) such that  f(x+132)=f(3x2)  and f'(0)=f'(12)=f'(2)=f'(3)=f'(92)=0 then the minimum number of zeroes of h(x)=(f''(x))2+f'(x)f'''(x)  in the interval  [0,9]  is  2 k  then  k  is equal to____P)10
B)If the maximum value of  |x47x24x+20x4+9x2+16| is P , then the value of  [P] (where [.] denotes  GIF)Q)8
C)Consider a function  f(x) where f:R+R  such that f(2023)=1 and f(x)f(y)+f(2023x)f(2023y)=2f(xy),x,yR+ then  10f(2)f(1)+f(2)=R)5
D)

If  α and  β   (α<β) are roots of equation  limtcos1[sin(tan1(txtx23tx+t1x))]=π6  

then the value of  (8α+2βαβ)

S)9

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a

AP:BQ:CR:DS

b

AQ:BP:CP:DR

c

AS:BQ:CR:DS

d

AP:BR:CS:DP

answer is D.

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Detailed Solution

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A)  Question Image

f(x+132)=f(3x2) f(x)=f(8x) f'(x)=f'(8x) f'(2)=f'(6)=0 f'(3)=f'(5)=0 f'(4)=f'(4)=0 f'(92)=f'(72)=0 f'(0)=f'(8);h(x)=ddx(f'(x)f''(x))

Clearly:  h(x) has minimum 21 zeroes

B)  x47x24x+20=(x24)2+(x2)2

x4+9x2+16=(x2+4)2+x2

Take the curve y=x2. Both square roots can be interpreted as distances. 

C)  x=y=1f2(1)+f2(2023)=2×f(1)

f(1)=1 y=1f(x).f(1)f(2023/x)f(2023)=2f(x) f(x)=f(2023)x yby  2023xf(x)f(2023/x)=1 f(x)=1,x>0

D)  limttxtx23tx+t1xtan[sin1(cosπ6)]

xx23x+1=31 x=3x29x+3 3x210x+3=0(3x1)(x3)=0x=13,3 (8α+2βαβ)=813+2312+81=9

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