Tan 9x - tan 5x/ 1+ tan 9x tan 5x

tan 4x

Step-by-step explanation:

Note the difference identity for tangent ratio is

tan(x - y) =

Given

← in the form of the right side of the expansion, thus

= tan(9x - 5x)

= tan 4x

guess at question:

a vertical line intersects the graph of g(x,y) = 0 at two points. what conclusion follows about the function f(x) implicitly defined by g(x,f(x)) = 0?

the domain of f(x) cannot include the x coordinate of any such vertical line.

informally, f(x) is not a function, and

g(x,y)=0 cannot be solved for y uniquely.

the relation r = {(x,y) such that g(x,y) = 0} is a function if

for all (a,b) ∊ r and (c,d) ∊ r, a=c implies b=d.

step-by-step explanation:

noncoplanar points are points that do not lie on the same line.