- #1

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## Main Question or Discussion Point

does cos + sin = 0?

- Thread starter Ry122
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- #1

- 565

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does cos + sin = 0?

- #2

- 2,063

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Do you want to if sin(somevalue1) + cos(somevalue2) = 0?

- #3

- 1,631

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like neutrino said cos + sin have no meaning. But if we get let's saydoes cos + sin = 0?

sin(2n pi)+ cos[(pi/2)+n pi] =0, and there are more samples like this. if this is what you meant at first place?????

- #4

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[tex]\mbox{for the above to be true},\\ cosx=-sinx \\ \Rightarrow cotx=-1 [/tex] (or [tex]sinx=0[/tex] but this does not hold for that.)

- #5

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Please only post calculus questions in this forum.

- #6

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LOL,this may well be calculus.....Please only post calculus questions in this forum.

[tex]Max(sinx+cosx)= \sqrt{2}[/tex]

[tex]Min(sinx+cosx)= -\sqrt{2}[/tex]

Since they function is continuous, it must have x such that f(x)=0

- #7

Gib Z

Homework Helper

- 3,346

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To OP: Short answer. No.

- #8

Gib Z

Homework Helper

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Wait up, perhaps you got confused with this:

[tex]\cos^2 x + \sin^2 x = 1[/tex]

[tex]\cos^2 x + \sin^2 x = 1[/tex]

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