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Q.

Match the following lists:

List IList II
a. Range of ƒ(x)=sin1x+cos1x+cot1x isp. [0,π2)(π2,π]
b. Range of ƒ(x)=cot1x+tan1x+cosec1x isq. [π2,3π2]
c. Range of ƒ(x)=cot1x+tan1x+cos1x isr. {0,π}
d. Range of ƒ(x)=sec1x+cosec1x+sin1x iss. [3π4,5π4]

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a

a-s         b-r             c-q       d-p

b

a-s         b-p            c-q       d-r

c

a-s         b-q            c-p       d-r

d

a-q         b-r             c-s       d-p

answer is B.

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Detailed Solution

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A.  ƒ(x)=sin1x+cos1x+cot1x=π2+cot1x,x[1,1]
For  x[1,1],cot1x[π4,3π4]
 π2+cot1x[3π4,5π4]
B.  ƒ(x)=cot1x+tan1x+cosec1x
=π2+cosec1x,   where  x(,1][1,)
Now  cosec1x[π2,0)(π2,π]
C.  ƒ(x)=cot1x+tan1x+cos1x
=π2+cos1x,  where  x[1,1]
 π2+cos1x[π2,3π2]
D. ƒ(x)=sec1x+cosec1x+sin1x,  where  x{1,1}
 =π2+sin1x, where  x{1,1}
Hence,  ƒ(x){0,π}

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