1
Question
Find the value of cos25°28'.
(Refer the trigonometric table for the values)
Find the value of cos25°28'.
(Refer the trigonometric table for the values)
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Solution
The correct option is B 0.9028
We can write,
25°28' = 25° 24' + 4'
From the table we have, cos25°24' = 0.9033
Mean difference for 4′ = 5
cos25°24' = 0.9033
4′ = - 5 (Mean difference to be subtracted for cosine)
____________________
cos25°28' = 0.9028
We can write,
25°28' = 25° 24' + 4'
From the table we have, cos25°24' = 0.9033
Mean difference for 4′ = 5
cos25°24' = 0.9033
4′ = - 5 (Mean difference to be subtracted for cosine)
____________________
cos25°28' = 0.9028
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