Subtract c and then x = y - c
And that's it!
Answer:
cosR = 
Step-by-step explanation:
assuming the right triangle has ∠ Q = 90° with legs 5 and 12
then this is a 5- 12- 13 right triangle with hypotenuse PR = 13 cm
then
cosR =
=
= 
Answer:
All real numbers
Step-by-step explanation:
See attachment for step-by-step