NDA Math Inverse Circular Functions

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For the next three (3) items that follow:
Consider x=4tan−1(
1
5
)
,y=tan−1(
1
70
)
and z=tan−1(
1
99
)
[NDA I 2015]
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Question : 19 of 25
 
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What is x equal to ?
[NDA I 2015]
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