Question

Where and why we use sin theta, cos theta, tan theta etc. ​

Answer 1

Answer:

We have seen Cartesian coordinate system.

Polar coordinate system.

Resolution of a vector can be done using these two angles.

Cos§ + iSin§

They assign direction and relation.

Expressing an angle in terms of 'thetha' helps:

In defining relationships of sides and hypotenuse of a triangle.

In establishing similarities in subtends.

In calculating an equivalent in a direction (with respect to the reference).

Using the sin and cos relations, equivalent forms of exponents can also be found.