1
Question
What is the tenths digit in the value of cos35°45'?
- 8
- 8
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Solution
The correct option is A 8
We can write,
35°45' = 35°42' + 3'
From the table we have, cos35°42' = 0.8121
Mean difference for 3′ = 5 (Mean difference to be subtracted for cosine)
cos35°42' = 0.8121
3′ = - 5
____________________
cos35°45' = 0.8116
So, tenths digit in the value of cos35°45' is 8.
We can write,
35°45' = 35°42' + 3'
From the table we have, cos35°42' = 0.8121
Mean difference for 3′ = 5 (Mean difference to be subtracted for cosine)
cos35°42' = 0.8121
3′ = - 5
____________________
cos35°45' = 0.8116
So, tenths digit in the value of cos35°45' is 8.
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