You have the following expression:

To verify the identity, you have that the left side of the equation becomes:
(1 + cosx)(1 - cosx) = (1 - cos^2 x)
because of the product of an expression by its conjugate result in a difference of squares. Or simplfy by expanding the factors and simplying.
Next, you have:
1 - cos^2 x = sin^2 x
because the Pythagorean identity.
Then, the identity is verified.
Answer:147,000 J
Step-by-step explanation:
Just did on apex
No. of People Cost
1 9.50
2 19.00
3 28.50
4 38.00
etc.
If we divide the cost in each row by the number of people in that row, we always have the proportion (ratio) of 9.50 / 1
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