Question

Evaluate (if possible) the sine, cosine, and tangent of the real number. (If not possible, enter IMPOSSIBLE.)
t = −π/4

Answer 1

ok, so convert to degrees

\[-\frac{\pi}{4} \text{ }^{c} = -45^{o}\]

lets also draw out the trig graphs:



can you see that
sin(-x) = -sin(x)
and cos(-x) = cos(x)
and tan(-x) = -tan(x)
?
so if we can work out the trig values of 45 then we can work out values for -45