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:
i think -14.5
Step-by-step explanation:
<span>A quadrilateral has congruent diagonals. It is probably a <u>Square</u></span>
Answer:
both statement have valid conclusions.
Step-by-step explanation:
A rhombus is a parallelogram with all sides equal.
A parallelogram has opposite angles congruent.
Therefore
both statements have valid conclusions.
3.3 is greater than 3.01
Hope this helps!
