Me! which of the following options is a pythagorean identity? a. (sin(x) - cos(x))^2 = 1 + 2sin(x)cos(x) b. (sin(x) - cos (x))^2 = 1 c. (sin(x) - cos (x))^2 = 1 - 2sin(x)cos(x) d. sin^2(x) - cos^2(x) = 1

Ithink your answer is c mark me brainliest

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm