Answer: ![\bold{b)\quad \dfrac{2\pi}{3},\dfrac{4\pi}{3},0}](https://tex.z-dn.net/?f=%5Cbold%7Bb%29%5Cquad%20%5Cdfrac%7B2%5Cpi%7D%7B3%7D%2C%5Cdfrac%7B4%5Cpi%7D%7B3%7D%2C0%7D)
<u>Step-by-step explanation:</u>
Note the following identities: tan² x = sec²x - 1
![\sec x=\dfrac{1}{\cos}](https://tex.z-dn.net/?f=%5Csec%20x%3D%5Cdfrac%7B1%7D%7B%5Ccos%7D)
tan² x + sec x = 1
(sec² x -1) + sec x = 1
sec² x + sec x - 2 = 0
(sec x + 2)(sec x - 1) = 0
sec x + 2 = 0 sec x - 1 = 0
sec x = -2 sec x = 1
![\dfrac{1}{\cos x}=-2\qquad \dfrac{1}{\cos x}=1\\\\\cos x=-\dfrac{1}{2}\qquad \cos x=1\\\\x=\dfrac{2\pi}{3}, \dfrac{4\pi}{3}\qquad x=0](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7B%5Ccos%20x%7D%3D-2%5Cqquad%20%5Cdfrac%7B1%7D%7B%5Ccos%20x%7D%3D1%5C%5C%5C%5C%5Ccos%20x%3D-%5Cdfrac%7B1%7D%7B2%7D%5Cqquad%20%5Ccos%20x%3D1%5C%5C%5C%5Cx%3D%5Cdfrac%7B2%5Cpi%7D%7B3%7D%2C%20%5Cdfrac%7B4%5Cpi%7D%7B3%7D%5Cqquad%20x%3D0)
Answer:
y = 4 (-3) - 2
y = -12 - 2
y = -14
Step-by-step explanation:
8.4 x 10^2 (10 to the 2nd power) = 8.4 x 100 = 840
The answer is A. 840
Answer:
9
Step-by-step explanation:
3.14 divided by 28.26 = 9
Answer:
m= 9
Step-by-step explanation:
63/7