Fill in the blanks:

Question

1. If tan x = -4 then tan(-x) =
2. If sin x = 0.1 then sin(-x) =
3. if cos x = 0.7 then cos(-x) =

Answer 1

tangent and sine are odd functions, so f(-x) = -f(x)

So: if tan(x) = - 4, tan(-x) = ?? and if sin(x) = - 0.1, sin(-x) = ??

Cosine in an even function, so f(x) = -f(x)

So if cos(x) = 0.7, cos(-0.7) = ??

Answer 2

See the videa.