Question

Help please

Answer 1

plug in pi/16 for x and see if it equals 0

Answer 2

so I would plug it in like this 2cos^(4*pi/16) ? or instead of pi 3.14?

Answer 3

\[2\cos ^{2}(4(\pi/16))-1\]

Answer 4

3.14 will also work instead of pi

Answer 5

did you get an answer?

Answer 6

yeah, it came out as 0.2701511529340699

Answer 7

it should be 0

Answer 8

I used a scientific calculator

Answer 9

use the pi symbol instead of 3.14

Answer 10

and make sure your calculator is in radian mode

Answer 11

I typed in this 2cos2(4(π/16))−1

Answer 12

Ignore the question marks

Answer 13

well i'm not sure, but i got 0 when i did the calculation which means the answer is true

Answer 14

ok, thank you

Answer 15

no problem