**If you need urgent support,**

**call 999**or go to your nearest A&E. To contact our Crisis Messenger (open 24/7) text**THEMIX to 85258**.Read the community guidelines before posting ✨

Aged 16-25? Share your experience of using the discussion boards and receive a £25 voucher! Take part via text-chat, video or phone. Click here to find out more and to take part.

Options

# Maths

Former Member
Posts: 1,876,323

**The Mix Honorary Guru**
Right im doing A2 maths, P3 and im stuck and need help badly!! its about double angle formulae. Can any one help???? i cant do it! :eek2:

Carrie x

Carrie x

Post edited by JustV on

0

## Comments

The Mix Honorary GuruI'm not really certain what your exact problem is? Which aspect are you stuck with?

That's the stuff with the Sin A + B = whatever, right?

Don't worry, I think everyone finds Maths challenging!

The Mix Honorary Gurusin2x + sinx = 0

solve for -180 < 0 < 180

i have a few like that and i have NO IDEA!!!!

The Mix Honorary Guruthus you have

2sinxcosx + sinx = 0

factorising,

sinx(2+cosx) = 0

2+cosx will never be 0 as cosx can only take values from 1 to -1, and even at -1 2+cosx will be 1. Thus sinx must be 0 for the solution to the equation.

sinx = 0

thus x = 0 is the solution.

The Mix Honorary GuruJust wanted to compare it to the Danish levels.

Thanks.

The Mix Honorary GuruEdited to say: Does that make sense?!

The Mix Honorary GuruO well, no more until summer. Alkyhol here I come!!!!!!!!!

The Mix Honorary GuruAre you sure that's how it factorises, not:

2sinxcosx + sinx = 0

sinx (2cosx + 1) = 0

No?

The Mix Honorary GuruIf your explanation meant that she was doing maths on a higher level, then yes, it made sense.

If she doesn't, then it... didn't

The Mix Honorary GuruTell me about it! I did AQA Specification A and it was horrible. But it could've been worse, though I had no idea how to work out the probability of a Type II Error - our teacher told us we didn't need to know! :mad:

DJP I believe your factorising is correct.

The Mix Honorary GuruThe Mix Honorary GuruDJP's factorisation was correct.

What the bloody hell is a type II error? Standard deviation, mean, chisquared, what happened to these in your course Alan? Prehaps the types are random and systematical errors?

Are any of you lot doing complex numbers and/ or vector algebra? If you're not you should read about them, thay are real handy.

The Mix Honorary Guru:cool:

What are the diffent types of maths a2 or as that you can take?

is it something like applied and pure or something?

I have to take maths for 6 form for the course I want to get into and i really hate it.

:mad:

The Mix Honorary Gurubut from inspecition, but for sin(2x)+sin(x)=0

x has to be 0 degrees because all parts will equal 0!