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Using trigonometric tables, find the approximate value of sec 58°. - Mathematics

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Question

Using trigonometric tables, find the approximate value of sec 58°.

Sum
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Solution

Given: Find sec 58° using trigonometric tables.

Step-wise calculation:

1. From trigonometric tables, cos 58° ≈ 0.5299.

2. `sec 58^circ = 1/cos 58^circ` 

= `1/0.5299 ≈ 1.8871` 

sec 58° ≈ 1.8871.

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Chapter 19: Trigonometric tables - Exercise 19A [Page 431]

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Nootan Mathematics [English] Class 10 ICSE
Chapter 19 Trigonometric tables
Exercise 19A | Q 1. (v) | Page 431
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