Subject: Trigonometric equations

Name: Cynthia
Who is asking: Student
Level: Secondary

Question:
How would you solve 2sin 3x-1=0? I don't know what to do with the 3.

Hi Cynthia,

I would make a change of variables. Let y = 3x and then the problem becomes solve 2sin y - 1 = 0. Thus sin y = 1/2. Now solve for y and since y = 3x, x = y/3.

Cheers,
Penny
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