Question

cos(2x-(Pi/10))=0 all solutions in interval [0,2pi)

Answer 1

cos(2x) = cos (pi/10)

Answer 2

Think of the unit circle, at what angles does the value of x =0?

Answer 3

Pi/2, 3pi/2

Answer 4

Pi/2 and 3pi/4 right?

So how to we get the 2x-pi/10 to equal the two angles I have? What will x need to be?

Answer 5

pi/20

Answer 6

3pi/2 right, sorry!!

Answer 7

So if x=pi/20, then is the expression equal to one of the two angles It needs to be?

Answer 8

G2g, cya!

Answer 9

i don't know i got up to pi/20 ok thanks for your help