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A 47. sec? 2 sec A sec A + 1

A 47. sec? 2 sec A sec A + 1

Mathematics For Machine Technology
Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter12: Multiplication Of Decimal Fractions
Section: Chapter Questions
Problem 1A: Round 0.42538 to 2 decimal places.
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Question

prove the identity

 

A 47. sec2 4 2 sec A sec A + 1
Transcribed Image Text:A 47. sec2 4 2 sec A sec A + 1
Expert Solution
Step 1

To prove 

sec2A2=2secAsecA+1

The identity used here is

secx=1cosxcos2x=2cos2x-1

 

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