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Student Support Forum: 'Solving trig equation, solution set contains dups' topicStudent Support Forum > General > Archives > "Solving trig equation, solution set contains dups"

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StephenDurr
07/12/13 4:01pm

I enter the following system into Solve:

Solve[{2 Sin[x]^2 + 3 Sin[x] + 1 == 0, 0 < x < 2 \[Pi]}, x]

It gives the following output:
{{x -> (7 \[Pi])/6}, {x -> (3 \[Pi])/2}, {x -> (3 \[Pi])/2}, {x -> (
11 \[Pi])/6}}

Why is (3 \[Pi])/2 listed twice (duplicated) in the output?

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Subject (listing for 'Solving trig equation, solution set contains dups')
Author Date Posted
Solving trig equation, solution set contains dups StephenDurr 07/12/13 4:01pm
Re: Solving trig equation, solution set contain... Bill 07/13/13 12:17pm
Re: Solving trig equation, solution set contain... StephenDurr 07/13/13 12:29pm
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