Question

What is the derivative of

cos(-x) + sin(-x)

Answer 1

sin(-x) - cos(x)

Answer 2

sin(-x) - cos(-x) sorry. I misstyped before.

Answer 3

I don't think that's right, man...

However, what are the two tringonometric functions that are positive regardless of the variable being positive or negative?

Is it

sin(-x) = sin(x)

or

cos(-x) = cos(x)

Answer 4

\[\sin(-x)=-\sin(x)\]
and
\[\cos(-x)=\cos(x)\]

Answer 5

Thank you! Besides cos, there's one other one...is it sec or csc?

Answer 6

\[\sec(x)=\frac{1}{\cos(x)}\]

\[\csc(x)=\frac{1}{\sin(x)}\]