Question

verify that the x-vales are solutions of the equation
2cos^2 4x-1=0

(a) x= pi/16
(v) x=3pi/16

Answer 1

try substituting

Answer 2

yeah idk how to solve after that xD

Answer 3

2cos^2 4 (pi/16)-1=0

Answer 4

what does pi/16 equal?

Answer 5

you multily it to 4 what do you get

Answer 6

\[\frac{\pi}{16} \times 4\]

Answer 7

4π/16

Answer 8

π/4

Answer 9

?

Answer 10

right

Answer 11

and what's cos pi/4?

Answer 12

you are familiar with the 45-45-90 triangle right?