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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

Total: 25

What is x equal to ?

tan−1(
60
119
)
tan−1(
120
119
)
tan−1(
90
169
)
tan−1(
170
169
)

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