Posted by sophie on Monday, June 1, 2009 at 8:26pm.
a) is the sine of 285
b) is the sine of 15, 165
c) is the sine of 75, 105
d) is the sine of -15, 195
check my thinking.
it's B?
none of the given answers is correct.
Are you sure you typed it correctly?
sin 225 = sin(180+45)
= sin180cos45 + cos180sin45
= 0 + (-1)√2/2
= -√2/2
no those are the options for sure :/
Are you sure it is not
> Use a sum or difference identity to find the exact value of sin255
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