Cos(2x) = cos^2(x) - sin^2(x) - cos(x)
but sin^2(x) = 1 - cos^2(x)
cos(2x) - cos(x) = cos^2(x) - (1 - cos^2(x) ) - cos(x)
cos(2x) - cos(x) = cos^2(x) - 1 + cos^2(x) - cos(x)
cos(2x) - cos(x) = 2cos^2(x) - 1 - cos(x)
cos(2x) - cos(x) = (2cos(x) + 1)(cos(x) - 1)
I think this is what you have asked for.
Answer:
The answer is 19
Step-by-step explanation:
10 plus 9 is 19
Answer: The area of triangle ΔXYZ is 12 square inches.
Step-by-step explanation:
Since we have given that
RS = 3 inches
XY = 2 inches
Area of ΔRST = 27 in²
Since ΔRST is similar to ΔXYZ.
So, using the "Area similarity theorem":
Hence, the area of triangle ΔXYZ is 12 square inches.
Answer:
sorry man I really don't know hopefully you can find an answer
Answer:
C. 1/25
Step-by-step explanation:
I assume this is a fair spinner and the probability of landing in all colors is equal.
First spin:
p(purple) = 1/5
Second spin:
p(purple) = 1/5
The two spins are independent events, so the probability of landing on purple twice is the product of the two individual probabilities.
p(purple and purple) = 1/5 * 1/5 = 1/25
