IntMath forum | Analytic Trigonometry

does it mean that sin^2 x+cos^2 x=1 is the same as sin x+cos x=1?

Relevant page

<a href="/analytic-trigonometry/2-sum-difference-angles.php">2. Sin, cos, tan of Sum of Two Angles</a>

What I've done so far

Read it several times and still trying to understand.

Welcome to the IntMath community.

The answer to your question is no.

Try the following. Choose any angle. Let's say 41 degrees.

Find this value:

`(sin 41)^2 + (cos 41)^2`

Now find this value

`sin 41 + cos 41`

Are they the same?

I guess not.

I am really thankful to get those solutions.

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Analytic Trigonometry lessons on IntMath

• Analytic Trigonometry
• 1. Trigonometric Identities
• 1a. Trigonometric Ratios - Interactive Graph
• 2. Sin, cos, tan of Sum of Two Angles
• 3. Double Angle Formulas
• 4. Half Angle Formulas
• 5. Trigonometric Equations
• 6. Express in the form R sin (θ + α)
• 7. Inverse Trigonometric Functions
• Inverse trigonometric function graph animations

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