16 over 70 or 8 over 35 to simplify.
Answer:
4(49v²+25)
Step-by-step explanation:
A circular wading pool at a park has a radius of 21 feet. Find the circumference of the pool. Use 22/7 <span>for .
C=2πr=2·π·21
≈131.94689ft
</span>
131.95
Cos(17pi/8)
cos(17π/8)
But π radians = 180°
17π/8 radians = (17/8) * 180 = 382.5
But this is more than 360°, so we have the basic angle by subtracting 360°
382.5 - 360 = 22.5
cos(17π/8) = Cos22.5
Recall double angle formula for cos.
cos2θ = 2cos²θ - 1
Therefore
cos(2*22.5) = 2cos²(22.5) - 1
cos45 = 2cos²(22.5) - 1
(√2)/2 = 2cos²(22.5) - 1
2cos²(22.5) - 1 = (√2)/2
2cos²(22.5) = (√2)/2 + 1
2cos²(22.5) = (2 + √2) / 2
cos²(22.5) = (2 + √2) / 4
cos22.5 = √( (2 + √2)/4) ................(note)
cos22.5 = √(2 + √2) / 2
Option (a) seems like the closest, comparing to (note) above.
Answer:
forty-five million nine hundred eighty-seven thousand one hundred fifty-nine point nine
