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:
14 : 8
Step-by-step explanation:
Answer:
750in
Step-by-step explanation:
The area of a triangle is 1/2bh (half x base x height)
Therefore 1/2 x 60in x 25in = 750in
5=1+1+1+1+1
1=5/5
5=5/5+5/5+5/5+5/5+5/5=25/5
5 and 1/5=5+1/5=25/5+1/5=26/5 which is C
Answer:
4
Step-by-step explanation:
12/3=4
