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Question

The number of integral values of k for which the equation sin1x+tan1x=2k+1 has a solution is

A
1
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B
2
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C
3
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D
4
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Solution

The correct option is B 2
1x1
Here sin1(x) c values can lie between -1 to 1 so tan1(x) domain is also restricted to -1 to 1.
Hence the range of the given expression is 3π42k+13π4
Therefore possible values of k are -1,0.

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