Inverse Circular Functions 3 Question 4

4. Considering only the principal values of inverse functions, the set A=x0:tan1(2x)+tan1(3x)=π4

(2019 Main, 12 Jan I)

(a) is an empty set

(b) is a singleton

(c) contains more than two elements

(d) contains two elements

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Answer:

Correct Answer: 4. (b)

Solution:

  1. Given equation is

tan1(2x)+tan1(3x)=π4,x0tan15x16x2=π4,6x2<1[tan1x+tan1y=tan1x+y1xy,xy<1]5x16x2=1,x2<166x2+5x1=0,0x<16[x0]6x2+6xx1=0,0x<166x(x+1)1(x+1)=0,

(6x1)(x+1)=0,0x<16x=16,1,0x<16x=16,[0x<16]

So ’ A ’ is a singleton set.

The solution of given differential equation represents a circle with centre on the X-axis.



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