Question

Find all solutions in the interval [0, 2π).

cos x = sin x

x = three pi divided by four., five pi divided by four.
x = pi divided by four., seven pi divided by four.
x = three pi divided by four, seven pi divided by two
x = pi divided by four, five pi divided by four.
@sithsandgiggles

Answer 1

welll can you take a screenshot ?

Answer 2

wont let me

Answer 3

why not ?

Answer 4

check your equation please :-)

Answer 5

i just can't.. others always help me without a screenshot or anything

Answer 6

alright...

Answer 7

so can u help me?

Answer 8

cuz i understand if u cant

Answer 9

yeah i'm going to help you
i just wanted to make sure that equation is correct :-)

Answer 10

alright i can retype it. it's cos x = sin x :-D

Answer 11

alright set it equal to one
divide both sides by cos

Answer 12

i dont know how to do any of this :/

Answer 13

i'm so sorry

Answer 14

alright there is another easy way to find x values
sin(x) = cos (x)
in unit circle sin x = y coordinate
cos (x) = x coordinate
so you can replace sin (x) by y and cos (x) by x
x=y now
now at what angle x and y values are same ??

Answer 15

http://prntscr.com/7f4tf7

Answer 16

45 degrees

Answer 17

yes there is one more !

Answer 18

and 225 degrees

Answer 19

yep you can convert those two angles to radians by using this formula \[\huge\rm d \times \frac{ \pi }{ 180 }\] or you can cheat(use unit circle )

Answer 20

:-)

Answer 21

lol umm.. x = pi divided by four, five pi divided by four? @Nnesha

Answer 22

yes right

Answer 23

and here is a link
https://www.youtube.com/watch?v=ww5pnpVGejk

Answer 24

WOOOOW! that was easier than i thought!

Answer 25

thank you so much! may I please get a medal?

Answer 26

np :-)

Answer 27

:)