# Does sin x + cos x = 1? [Solved!]

**Rapelang** 10 Dec 2015, 03:32

### My question

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

### Relevant page

2. Sin, cos, tan of Sum of Two Angles

### What I've done so far

Read it several times and still trying to understand.

X

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.

## Re: Does sin x + cos x = 1?

**Murray** 10 Dec 2015, 19:24

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?

X

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?

## Re: Does sin x + cos x = 1?

**Rapelang** 11 Dec 2015, 06:29

I guess not.

I am really thankful to get those solutions.

X

I guess not.
I am really thankful to get those solutions.

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