In this right triangle lmn l and m are complentary angles and sin (l) is 19\20 what is cos (m)

In any right triangle ABC, with right angle A we have the following:



and

.

This means that the sine of a non 90° angle, is equal to the cosine of its complementary angle.

Thus, .

(Take a look at the picture. From the definition of trigonometric ratios in right triangles we have :

and
 )

19/20