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**Identity****Member**- Registered: 2007-04-18
- Posts: 934

Find the sum of solutions in the interval [0, pi], of:

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**Identity****Member**- Registered: 2007-04-18
- Posts: 934

The number of solutions of the equation *a*sin(2x)=*a*, where x ∈ [-2pi, 2pi], where a ≠ 0, is:

a) 2

b) 4

c) 6

d) 8

e) 12

I got... 9...

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**JaneFairfax****Member**- Registered: 2007-02-23
- Posts: 6,868

First one.

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**JaneFairfax****Member**- Registered: 2007-02-23
- Posts: 6,868

Second one.

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**Identity****Member**- Registered: 2007-04-18
- Posts: 934

thanks Jane, I made a mistake with the second one, thinking sin2x = 0 somehow. Nice solution to the first problem though.

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