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# Higher Maths Question Help. watch

1. ~SOLVED~

Every time I try this I only get one of the correct solutions. Can you work it out please?

can you please show me all of the working so I can understand where I went wrong.

2. (Original post by GreigM)
Every time I try this I only get one of the correct solutions. Can you work it out please?

can you please show me all of the working so I can understand where I went wrong.

What did you try?
I dislike providing full solutions is all
3. I will throw in one formula to get you going and then work from there.

Spoiler:
Show
Sin2(theta) + Cos2(Theta) = 1
4. (Original post by Scienceisgood)
I will throw in one formula to get you going and then work from there.

Spoiler:
Show
Sin2(theta) + Cos2(Theta) = 1
I considered this but decided expressing it in harmonic form was a better method.
5. Wave Form can help:

aCosx + bSinx can be rewritten as RCos( x - k )

6. This is my working if this is of any use to any of you.

The range is from 0 to 2pie.
Posted from TSR Mobile
7. (Original post by GreigM)

This is my working if this is of any use to any of you.

The range is from 0 to 2pie.
Posted from TSR Mobile
(2Pi + 1.98) -4.07 is still in the specified range.
EDIT: See post below - made an error
8. (Original post by joostan)
(2Pi + 1.98) -4.07 is still in the specified range.
Would I not add the 4.07?

Posted from TSR Mobile
9. (Original post by GreigM)
Would I not add the 4.07?

Posted from TSR Mobile
You're quite right, I did this question using sin rather than cos and got a bit muddled
Its: 1.98 + 4.07< 2Pi
10. Use the 1.98 you scored out it is actually in the boundaries

This was posted from The Student Room's iPhone 4s app.
11. (Original post by Jack--)
Use the 1.98 you scored out it is actually in the boundaries

This was posted from The Student Room's iPhone 4s app.

Thanks. I just noticed that a few minutes ago.

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