Answer: sqrt(19)/10
Step-by-step explanation:
sinx=0.9
x=arcsin(0.9)
Insert x for cos(x):
cos(arcsin(0.9)=
Use identify
, so

Sorry if this is confusing.
Answer:
=7.2×10⁵
is in scientific notation
I think it's something like a mile or so, maybe a mile and a half. Sorry if I'm wrong.