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

- anonymous

- schrodinger

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- Nnesha

welll can you take a screenshot ?

- anonymous

wont let me

- Nnesha

why not ?

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## More answers

- Nnesha

check your equation please :-)

- anonymous

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

- Nnesha

alright...

- anonymous

so can u help me?

- anonymous

cuz i understand if u cant

- Nnesha

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

- anonymous

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

- Nnesha

alright set it equal to one
divide both sides by cos

- anonymous

i dont know how to do any of this :/

- anonymous

i'm so sorry

- Nnesha

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 ??

- Nnesha

http://prntscr.com/7f4tf7

- anonymous

45 degrees

- Nnesha

yes there is one more !

- anonymous

and 225 degrees

- Nnesha

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 )

- Nnesha

:-)

- anonymous

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

- Nnesha

yes right

- Nnesha

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

- anonymous

WOOOOW! that was easier than i thought!

- anonymous

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

- Nnesha

np :-)

- anonymous

:)

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