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#1 Help Me ! » Trigonometric Identities » 2015-04-20 05:00:21
- Beverrrn
- Replies: 1
I'm in tears over this homework (think the stress is getting to me...)
1)
a) Given that 5sinθ=2cosθ, find the value of tanθ
b) Solve, for 0≤ x<360° 5sin2x=2cos2x
giving your answers 1dp
2)
a) Show that the equation tan2x=5sin2x can be written in the form (1-5 cos2x) sin 2x=0
b) Hence solve, for 0≤x≤180° tan2x=5sin2x to 1dp, showing clearly how you obtained yours answers
#2 Help Me ! » Graphs of Trigonometric Functions?! C2 » 2015-03-22 06:51:17
- Beverrrn
- Replies: 2
My maths teacher who taught this is terrible. We have homework due in tomorrow (like a mixed exercise from the book) and I can't do any of it, not even the first few questions. She went through very briefly positive and negative angles and the CAST diagram in like 20 minutes, then left the lesson during the graphs section...So I basically have no knowledge on this topic...Can anyone help?
I KNOW NOTHING!
#3 Re: Help Me ! » C2 Questions! » 2015-03-09 07:11:33
So for b did you get 10.26 8-)
#4 Re: Help Me ! » C2 Questions! » 2015-03-09 06:49:36
That's a perfect diagram!
And thank you for the first part, seems so simple once you get the method aha 
But for part b, why would you use length of sector? Would it not be length of arc?
#5 Re: Help Me ! » C2 Questions! » 2015-03-09 06:09:15
I'm not sure how to put pictures on here, but I described it above. It's a circle, with a triangle in. O is the centre. A is one corner, B is another corner. AO and BO are both the same length (radius)
#6 Help Me ! » C2 Questions! » 2015-03-09 05:01:51
- Beverrrn
- Replies: 9
1) The diagram above shows the sector AOB of a circle with centre O and radius 6.5cm and <AOB= 0.8 radians
a) Show that the length of the chord AB is 5.06cm, to 3sf
b) The segment R, shaded in the diagram above, is enclosed by the arc AB and the straight line AB. Calculate, in cm, the perimeter of R.
Please help...
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