The formulas in question are
sin²(x) = (1 - cos(2x))/2
cos²(x) = (1 + cos(2x))/2
Then
sin⁴(4x) = (sin²(x))²
… = ((1 - cos(2x))/2)²
… = (1 - 2 cos(2x) + cos²(2x))/4
… = (1 - 2 cos(2x) + (1 + cos(4x))/2)/4
… = 1/4 - 1/2 cos(2x) + (1 + cos(4x))/8
… = 3/8 - 1/2 cos(2x) + 1/8 cos(4x)
Answer:
11%
Step-by-step explanation:
The percentage of the discount is 1012/9200 x 100 = 11%
(a) is False (b) is true (c) is true