cosine law

Direction cosine and ratio of line

cosine rule using dot product

Using the sine rule , prove the cosine rule.

The sine; cosine and (tangent) function is continuous everywhere (on domain).

Direction cosines

The law of cosines proof:

Types OF vectors || Triangle law OF addition || Parallelogram law OF addition || Section formula || Direction Ratio and Direction Cosine

Sine And Cosine Rule For Triangels

Direction-cosines of x-axis are, .............. .

Direction-cosines of z-axis are ................. .