Question

sin 195°, without using tables.. Help please

Answer 1

just type it in your calculator!

Answer 2

sin195=sin(180+15)=-sin15

Answer 3

We cant use calculators

Answer 4

its \[-\sqrt{6}+\sqrt{2}/4
\]

Answer 5

sin(225 - 30)

Answer 6

sin(225) - sin(30)


sorry

Answer 7

Okay, I forgot. It's one of those...

Answer 8

Hero aren't u supposed to express it as son(180+x) or smth 90+smth

Answer 9

It doesn't have to have "180" in it , no

Answer 10

well u mist express it as smth familiar ...wht sin225?

Answer 11

√2/4(1-√3) this is in our workbook as result

Answer 12

I mean -sqrt2/2

Answer 13

Your workbook sucks

Answer 14

SO please how can i get this result √2/4(1-√3) withou using calculator or tables?
Yes, its pellet :(

Answer 15

It's supposed to be something like what mfleisch got

Answer 16

I got ur point Hero,sorry :):)

Answer 17

I sont know how can they get tthis result √2/4(1-√3) ..

Answer 18

It's some retarded long way of doing something very simple

Answer 19

So, if i do sin(225) - sin(30) = 1.2 its right result?

Answer 20

That is not correct
You need to use this formula:
sin(A-B)=sin A cos B - cos A sin B

Answer 21

sin225=-sqrt2 /2
sin 30=0.5

Answer 22

cos 225=-sqrt2 /2
cos 30=sqrt3 /2

Answer 23

I think you have everything to solve it now

Answer 24

ok i will try t, thanks :)

Answer 25

Sorry, haven't done these in a while and I didn't memorize the formulas

Answer 26

On my calculator, I got the same answer as in your book so I figured I must have been doing something wrong

Answer 27

However, the answer is still equivalent to mfleisch's result. The only difference is, your book factored out sqrt{2}

Answer 28

ok, thanks guys ;)