Question

find all the solutions in the interval [0,2pi), rounded to 5 decimal places (enter all answers as a comma separated list)

5cos(2theta)=4

Answer 1

use your calc

Answer 2

how?

Answer 3

your cal dont have one function acos or \[\cos^{-1}\]

Answer 4

?

Answer 5

i cant set 5cos(2theta) equal to 4

Answer 6

cos(2.theta)=4/5

Answer 7

the calculator wont solve that..

Answer 8

you have a scientific calc?

Answer 9

yea

Answer 10

so must have

Answer 11

look for this function acos(4/5) or cos−1(4/5)

Answer 12

what about the 2 in the problem?

Answer 13

than divide your answer by two

Answer 14

it worked! thank youu