Question

Please help! Click on attachment

Answer 1

what does that say by the way 67 degrees 30 ? :s

Answer 2

sin 67 degrees 30' :)

Answer 3

i can't see your picture - its blank

Answer 4

Just a second

Answer 5

Can you see it?

Answer 6

yes

Answer 7

i think you can se

sin^2 x - (1/2) ( 1 - cos 2x)
cos 2x will be cos 135 = -1/sqrt2

Answer 8

sin^2 x = 1/2( 1 - (-1/sqrt2))

i'l check if this formla is right

Answer 9

yes - that correct formula

Answer 10

have you tried working this out?

Answer 11

Ok, so I use that formula?

Answer 12

i get
sqrt 2 + 1
---------
2 sqrt2

and that = sin^2 x !!!
- thats nothing like the choices

well - i;m not sure - i can't get any of the options
maybe i should use another formula

Answer 13

Hmmm... That's weird :/ See? It's difficult

Answer 14

hold on - lets rationalize the denominator
if we multiply top bottom by sort 2 we get

2 + sqrt 2
--------
4

now take square root

= sqrt( 2 + sqrt2)
-------------
2

thats it - option 3

Answer 15

in math they don't like square roots in denominator

Answer 16

ok?

Answer 17

Oh O.K. I understand. Thank you so much!

Answer 18

yw