How to find the unit vector

The coordinate of the unit vector can be set as (cosx, SiNx), because (cosx) '= - SiNx, (SiNx)' = cosx. The derivative coordinate is (- SiNx, cosx) the product of the two coordinates = - cosxsinx + sinxcosx = 0. So the unit vector is perpendicular to its derivative vector

RELATED INFORMATIONS

1. Is vector as like as two peas? What is the reason why mathematics is usually referred to as vectors in physics?
2. Is the vector in mathematics related to the vector in physics
3. The difference between vector and physical vector
4. Subtraction of coordinate vector What is (- 6, - 5) - (4, - 6)?
5. Subtraction of vector Some judgment question vector ab - vector BC = vector AC, seeking advice vector ab - vector BC should be wrong, but I can't work it out. I'm depressed
6. The subtraction of space vector satisfies the combination law What is the law of association?
7. Is there an association law for vector subtraction?
8. Why does the scalar product of a vector not satisfy the associative law
9. Does space vector subtraction have exchange rate and combination law Space vector addition has exchange rate, subtraction has
10. Is there a distributive law for vector subtraction!
11. What is fraction addition and subtraction
12. The moment of momentum of a particle relative to a fixed point is usually regarded as a location vector at the center of the moment? I asked what these two concepts mean, not about the right-handed system
13. How to calculate the length of a vector
14. Why can vectors (vectors in Physics) be calculated from geometry? How can we prove that everything obeys this law? Why should we abide by this Law and not others?
15. How to calculate the length of a complex vector? Suppose I have a two-dimensional complex vector a, how can I prove that the square of its length is equal to the conjugate product of a and a? In other words, why is it not equal to the product of a and a itself? I know that the conjugate of a and a can guarantee that the product is positive, but why is the length calculated in this way?
16. How to calculate the vector product vector a * vector b (how to determine the size and direction) Note that * is not a dot product, and the result is not a number, but a vector Take the operational expression of physical quantities such as moment and angular momentum as an example
17. Vector computing Vector contains direction and size, but with direction operation does not change the size of it?
18. On vector operation There are dot multiplication and cross multiplication in vector operation. What's the difference and connection between them? For example, in the moment M = f * l, why can't dot multiplication be used instead of cross multiplication? I know that the direction is determined by the right-hand screw rule. Is the size a simple multiplication?
19. Application of vector method How to use vector to show plane parallel
20. Find the normal vector (urgent)! Known surface equation is x ^ 2 + 2Y ^ 2 + 3Z ^ 2 = 15, find the normal vector