Question

For what x-value(s) does cos(x) = -1?

-360°

360°

all of the above

none of the above

Answer 1

would it be none of the above?

Answer 2

we can try first for 360degree

Answer 3

cos360=cos (360+0)=cos0=1

Answer 4

so 360 degree is not true!!!

Answer 5

i think the right one is 180 and -180 so the answer would be none of the above right?

Answer 6

ya u r right!!!!

Answer 7

ok thanks i have one more but it has no choices

Answer 8

For what x-value(s) does cos(x) = 0?

Answer 9

u r most welcome!

Answer 10

plz ask ur another question as new 1

Answer 11

ok

Answer 12

waiting for question!!!!!