# Thread: 2U Trig Q?? :O

1. ## 2U Trig Q?? :O

I got this off a 2U school internal exam (Gosford High) and I'm super confused as to why the answer is C, 5 solutions. What do you guys think? I got B, 4 solutions, so if anyone could explain I'd appreciate it

2. ## Re: 2U Trig Q?? :O

You have 2 equations

$sinx = 1 \ \ x = \frac{\pi}{2}$

$cos2x = 0$

The sine equation only has one solution, the cos equation has 4 solutions between 0 and 2pi

3. ## Re: 2U Trig Q?? :O

ooooh! ok thanks - I didn't realise the period was pi not 2pi
ps. woah fast response haha

4. ## Re: 2U Trig Q?? :O

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