Hello,  I need help understanding how to form a general formula, using f(x)=5 tan x, for all the solutions to f(x)=-5 by using angle(s) in the interval [0,pi) and adding multiples of some integer k. I do not know how to input -5 into 5 tan x, or how to begin.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.3: Trigonometric Functions Of Real Numbers
Problem 49E
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Hello, 

I need help understanding how to form a general formula, using f(x)=5 tan x, for all the solutions to f(x)=-5 by using angle(s) in the interval [0,pi) and adding multiples of some integer k. I do not know how to input -5 into 5 tan x, or how to begin. 

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