Find the value of tan70°13'.
(Refer the trigonometric table for the values)

2.7902

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2.7804

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3.7802

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2.7802

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Solution

The correct option is D 2.7802
We can write,
70°13' = 70° 12' + 1'
From the table we have, tan70°12' = 2.7776
Mean difference for, 1′ = 26

tan70°12' = 2.7776
+ 1′ = 26 (Mean difference to be added for tan)
____________________
tan70°13' = 2.7802

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