Question

In right triangle DEF, d = 8, e = 10, f = 6. Which is cos D + cos F?

Answer 1

Ah, this is different. I think D and F are angles to be found

Answer 2

but which angle is the right triangle...I assume E

Answer 3

I think so, there is no picture.

Answer 4

\[D = \sin^{-1}(\frac {8}{10}) , F = \sin^{-1} (\frac {6}{10}) \]

Answer 5

I get sin D + cos F = 1.6