Step-by-step explanation:
note that
sin²x = (1-cos²x)
LHS= cos²x - 2 sin²x
= cos²x - 2(1-cos²x)
= cos²x - 2 + 2cos²x
= 3cos²x - 2
or
cos²x = (1-sin²x)
LHS= cos²x - 2 sin²x
=1-sin²x - 2 sin²x
= 1-3sin²x
Answer:

Step-by-step explanation:
Use the <u>Distance Formula</u> to help you determine the distance between two given points:

First point: 
Second Point: 
-Apply the two given points onto the formula:
First point: 
Second point: 

-Solve for the distance:





Therefore, the distance is
.
Answer:
it stays the same because there is no simplifying it and the re are no like terms
Answer:
15
Step-by-step explanation:
(3/5)*25=15