Answer: 
<u>Step-by-step explanation:</u>
Given: cos x =
, x is in Quadrant 4
Use Pythagorean Theorem to find sin x:
8² + y² = 17²
y² = 17² - 8²
y² = 289 - 64
y² = 225
y = 15
→ sin x = 
Use the double angle formula to find cos (2x):

The number of a acute angle in a rectangle is 89 through 1 the obtuse angle in a rectangle is 91 through inf and a right angle of a rectangle is 90 degrees
Answer:
b^20/a^12
Step-by-step explanation:
b to the power of 20 over a to the power of 12
Answer:
1/5
Step-by-step explanation:
5/5 - 4/5 = 1/5
Answer:
sorry i dont know
Step-by-step explanation:
but do the ones in the () first always