(2cosA+1) (2cosA-1)=2cos2A+1 prove that

Step-by-step explanation:

We need to prove that ,

We can start by taking RHS and will try to obtain the LHS . The RHS is ,

We know that , cos2A = 2cos²A - 1 ,

Simplify the bracket ,

Add the constants ,

Write each term in form of square of a number ,

Using (a+b)(a-b) = a² - b² , we have ,

This equals to LHS , therefore ,

Hence Proved !

answer: a) (0,0), (1,1), (2,8), and (3,27).

step-by-step explanation:

0^3=0

1^3=1

2^3=8

3^3=27

in effect, the exponential equation for this would me y=3^x. each x-coordinate cubed is giving the y coordinate, so a is your answer : )