Question

Which of the following equations has no solutions:
a) sec x + 2 = 0
b) cos x- 3 = 0
c) sin x ( sin x + 1) = 0
3 tan x- 1 = 0

Answer 1

not sure

Answer 2

hint : range of cos function is ??

Answer 3

do you know or can you find out ?

Answer 4

- infinity to infinity ?

Answer 5

thats the domain!
range of cos function is from -1 to 1
and cos x -3 = 0 means cos x = 3
is that even possible ? :)

Answer 6

no

Answer 7

correct!
so, cos x+3 does not have any solution for x :)

Answer 8

***cos x =3

Answer 9

thank you

Answer 10

welcome ^_^