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# More trig watch

1. 3Sin²x=sinxcosx

Find x where 0°≤x≤360°
i'm missing 3 answers
2. Bring the sinxcosx to LHS of equation. Factorise, consider when one of the 2 factors is 0, solve for x.
3. (Original post by thefatone)
3Sin²x=sinxcosx

Find x where 0°≤x≤360°
i'm missing 3 answers
you should use this site http://www.examsolutions.net/maths-r.../C3/module.php covers the spec very well. It's edexcel but hes got other spec too
4. (Original post by Ano123)
Bring the sinxcosx to LHS of equation. Factorise, consider when one of the 2 factors is 0, solve for x.
i get sinx(3sinx-cosx)=0
what do i do with (3sinx-cosx)
5. (Original post by Shiv is Light)
you should use this site http://www.examsolutions.net/maths-r.../C3/module.php covers the spec very well. It's edexcel but hes got other spec too
This is C2
6. (Original post by thefatone)
i get sinx(3sinx-cosx)=0
what do i do with (3sinx-cosx)
For the LHS to be 0, either sinx=0 or 3sinx=cosx.
7. (Original post by thefatone)
This is C2
c3 for edexcel m8
8. (Original post by Shiv is Light)
c3 for edexcel m8
is it? i know you learn loads of trig identities in c3 but i do learn 2 identities in c2
and they are sinx/cosx=tanx and sin²x+cos²x=1
9. (Original post by Ano123)
For the LHS to be 0, either sinx=0 or 3sinx=cosx.
thanks so much, that's where i went wrong
10. (Original post by thefatone)
is it? i know you learn loads of trig identities in c3 but i do learn 2 identities in c2
and they are sinx/cosx=tanx and sin²x+cos²x=1
oh right, the question you posted doesn't use the trig identity you use in c3, my bad. You can still use exam solutions for c2. I got a B last year using exam solutions. Good luck m8!

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