Solve cos (x) tan (x) -1/2=0 over the interval [0,2π].

First, we are going to add from both sides of the equation: 



Next, we are going to use the trig identity:  to rewrite our expression:




Finally, using our unitary circle, we can infer that  from 0 to  when  and 

We can conclude that the solutions of the equation cos (x) tan (x) -1/2=0 over the interval [0,2π] are: 

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If you need an equation, it would be y=2x+8, y would be how long it grew, x being weeks.if you need how long he was asleep, it would be 4 weeks if he started with no beard, the equation would be x=8÷2if he did have a beard before hand, the equation would be 2w+x=8