Question

Meaning of tan sin and cos

Answer 1

The sine/sin of the angle = the length of the opposite side divided by the length of the hypotenuse.

The cosine/cos of the angle = the length of the adjacent side divided by the length of the hypotenuse.

The tangent/tan of the angle = the length of the opposite side divided by the length of the adjacent side.

Answer 2

Those are trigonometric identities. and tan is just a shortened version of tangent, same for cos is means cosine