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Q.

If the mapping f(x)=ax+b,  a>0 maps [1,  1] onto[0,  2] then cot(cot17+cot18+cot118)=

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a

f(1)1

b

f(1)

c

f(1)+1

d

f(0)

answer is D.

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Detailed Solution

f(x)=x+1

cot(cot17+cot18+cot118)=

cot(tan117+tan118+tan1118)

=cot(tan11555+tan1118)

=cot(tan1(65195))

=cot(tan1(13))

=cot(cot1(3))

=f(1)+1

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