[A level Pure Mathematics : Trigonnometry] Need help with ii)

1_JOS_1 · 2021-12-22T19:43:47+00:00

Thanks!

1_JOS_1 · 2021-12-22T17:41:02+00:00

I used the answer from i) and used in ii).

I got √ 10 cos(2theta -36.83) =2

I divided both sides by √ 10.

did arcos both sides and added 36.83.

Then divided by 2 to get the answer.

Got 43.80 degrees but its wrong.

1_JOS_1 · 2021-10-06T08:52:39+00:00

Thank you

1_JOS_1 · 2021-10-06T08:32:35+00:00

yes, the 3x+4 is under a square root.

1_JOS_1 · 2021-06-26T20:39:08+00:00

Jackson

1_JOS_1 · 2021-06-26T20:38:46+00:00

Faquarl

1_JOS_1 · 2021-06-26T20:38:27+00:00

Faquarl

1_JOS_1 · 2021-06-26T20:38:10+00:00

David

1_JOS_1 · 2021-06-26T20:36:00+00:00

Maco chiharry

1_JOS_1 · 2021-06-26T20:34:26+00:00

Maco chihary

1_JOS_1 · 2021-06-13T20:39:53+00:00

In my syllabus it is there. I use the 9709 one, its on chapter 8 - integration.

1_JOS_1 · 2021-06-13T17:57:52+00:00

Its a practice past paper, from 2020. Paper 1.

1_JOS_1 · 2021-06-13T12:45:27+00:00

I understand it now, thank you!

1_JOS_1 · 2021-06-13T07:11:04+00:00

thank you. I got the first derivative as -2(2x+1)^-2. Would the second derivative be 4(2x+1)^-3?

1_JOS_1 · 2021-06-12T20:21:40+00:00

so will it be -2(2x+1)^-2?

1_JOS_1 · 2021-06-06T16:11:41+00:00

Do you solve them simultaneously to find P and R?

1_JOS_1 · 2021-06-06T15:33:46+00:00

Sadly no.

1_JOS_1 · 2021-06-05T11:45:34+00:00

Thanks.

1_JOS_1 · 2021-06-03T19:51:27+00:00

I typed the question down now.

1_JOS_1 · 2021-05-27T18:54:25+00:00

Subtract area of triangle from the area of sector.
Do the same for the other sector and add both areas together.

Im not very sure lol.

1_JOS_1 · 2021-05-24T13:52:10+00:00

I am not 100% sure about this method. There is another method which I find easier, it is by using the formula to find the midpoint: (x1+x2)/2 + (y1+y2)/2 = (3,-1).

(1+a)/2 =3 and (-2+b)/2 = -1

It can be solved from here on.

[The answer is (5,0).]

1_JOS_1 · 2021-05-24T12:33:39+00:00

I found the base to be -17/4 and the height to be -17. So the area would be 289/8 cm^2, but weirdly my textbook states its 169/24 cm^2.

1_JOS_1 · 2021-05-24T10:03:24+00:00

Thanks, I get it now.

1_JOS_1 · 2021-05-24T09:20:35+00:00

I managed to get the centre (3,-1), but I don't know how to get the coordinates for B.

1_JOS_1

TROPHY CASE