Answer:
cos 4u = co^s2 2u - sin^2 2u
Step-by-step explanation:
cos 4u = co^s2 2u - sin^2 2u
Let 4u = 2x
cos 2x = cos^2 x - sin^ 2 x
cos (x+x) = cos^2 x - sin^ 2 x
Using cos(x+y) = cos(x)cos(y) -sin(x)sin(y)
cos(x) cos(x)- sin(x) sin (x)= cos^2 x - sin^ 2 x
cos^2 (x) -sin^2 (x) =cos^2 x - sin^ 2 x
Since this is true
cos 2x = cos^2 x - sin^ 2 x
This is true
Substituting 4u back for 2x
cos 4u = co^s2 2u - sin^2 2u
This is true
Answer:

Step-by-step explanation:

Second equation times 3:

1st equation minus equation above:

Insert to equation:

Which what ? Put the question and will help you
$39.935 is the answer I calculated, but it could very easily be wrong
Given:
A bisector is a line or point that divides a line in half. So point M is in the middle of the entire line ST.
The bisector would be the line MW
This means line MT is half of the enitre line ST so then the entire line is 19*2.
Answer:
ST = 38
Bisector is line MW