Question

What is the y-value of sin(x) when x= -180°?

Answer 1

sin(x) = sin(-180) ... replace x with -180

sin(-180) = -sin(180) ... use the rule sin(-x) = -sin(x)

-sin(180) = -1*sin(180) = -1*0 = 0

I'm using the unit circle on the last step to evaluate sin(180)

Answer 2

So the answer would be 0?

Answer 3

correct