Question

for 0x=90 cosx=1/3 --> x=70.53 what're the other roots?

Answer 1

cosx=1 -->x=90 ???

Answer 2

you took y =cos x
y=1
cos x = 1
for which angle ?

Answer 3

x=0,360

Answer 4

those are not in the range, right ?
so no roots for cos x = 1

Answer 5

yup

Answer 6

cosx=1/3
x=70.528

Answer 7

\(\cos (360-x)=\cos x\)

Answer 8

289.4

Answer 9

yes, correct :)

Answer 10

just 2?

Answer 11

yes.