Express as a product: 1-2cos(2a) I've been really struggling with this. Please help & explain it.

(2sin a - 1)(2sin a + 1)

Step-by-step explanation:

Here, we want to express what is given as a product

Mathematically;

cos2a = 1-2sin^2A

So we have;

1-2(1-2sin^a)

= 1 - 2 + 4sin^2a

= 4sin^2a - 1

Using the difference of two squares, this is;

(2sin(a) - 1)(2sin a + 1)

the workers who do no drive has no reasonable reason to buy gasoline due to they don't have anything to use it for

step-by-step explanation:

graph using a few selected

x         y

-1       15

0         6

1         2.4

2       0.96