Question

TOPIC: (trigonometry) Addition and Subtraction Identity FOrmulas


Find the value of:
sin(-105)

Answer 1

@agent0smith

Answer 2

@Loser66

Answer 3

@Compassionate

Answer 4

105 = 60 + 45
and sin(-x) = -sinx
so sin(-105) = -sin(60+45)

Answer 5

is the answer = (2(sqrt6))/4
?

@agent0smith

Answer 6

I don't know, wolfram alpha could check for you. Just use the angle sum formula

Answer 7

i did it but i'm not sure with the signs