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How to use special triangles to solve trig

1466185582078434130295.jpg need help with 5a using special triangles cheers
Reply 1
Avatar for Notnek
Notnek
21
Original post by coconut64
1466185582078434130295.jpg need help with 5a using special triangles cheers

Here's one of the special triangles:



Using the triangle, if sin x = sqrt(3)/2, what is x?

Then how can you use that to solve sin 2x = sqrt(3)/2 ?
Reply 2
Avatar for coconut64
coconut64
OP
16
Original post by notnek
Here's one of the special triangles:



Using the triangle, if sin x = sqrt(3)/2, what is x?

Then how can you use that to solve sin 2x = sqrt(3)/2 ?


Hi, I have drawn something like this as well and I only got 1/6 pi rads. But I want the range from 0-2pi, this method only gives me one answer though... Thanks
Reply 3
Avatar for Notnek
Notnek
21
Original post by coconut64
Hi, I have drawn something like this as well and I only got 1/6 pi rads. But I want the range from 0-2pi, this method only gives me one answer though... Thanks

Oh right I didn't realise this was an A Level question (I assume it is?).

Well how do you normally get extra solutions once you've found one solution?
Reply 4
Avatar for coconut64
coconut64
OP
16
Original post by notnek
Oh right I didn't realise this was an A Level question (I assume it is?).

Well how do you normally get extra solutions once you've found one solution?


Thanks. I know what to do now.

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