Application of Mean Value Theorem: 4. Prove the identity: sin² x + cos² x = 1, using the Mean Value Theorem.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 34E
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Application of Mean Value Theorem

Application of Mean Value Theorem:
4. Prove the identity: sin² x + cos? x = 1, using the Mean Value Theorem.
Transcribed Image Text:Application of Mean Value Theorem: 4. Prove the identity: sin² x + cos? x = 1, using the Mean Value Theorem.
Expert Solution
Step 1

The given identity is

sin2x+cos2x=1

Let the right hand side of the function,

sin2x+cos2x

We know that the sine function and cosine function both are continuous in the -, and both are differentiable-,.

Differentiate the above function

f'x=ddxsin2x+ddxcos2xf'x=2sinxcosx+2cosx-sinxf'x=2sinxcosx-2sinxcosxf'x=0

 

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