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Bobby Bones
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Bobby Bones
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01-05-2019
Last Activity
01-14-2019
07:31 AM
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01-11-2019,
10:51 AM
Bobby Bones
replied to a thread
Calculating percentages between Points
in
Arithmetic
The line B points will always fall at 80% between the corresponding points on line A.Except point 1, which is 0%, and point 6 which is 100%. A...
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6 replies | 408 view(s)
01-11-2019,
08:11 AM
Bobby Bones
replied to a thread
Solve: cos^−1(2x) + sin^−1(x) = π/3
in
Geometry and Trig
can u read the attachments? They are too blurred when i click on them.
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19 replies | 639 view(s)
01-11-2019,
08:09 AM
Bobby Bones
replied to a thread
Solve: cos^−1(2x) + sin^−1(x) = π/3
in
Geometry and Trig
I posted a copy of one full paper, just yesterday, please check - the thread should be jusy a few places above this one. I'll attach the full paper...
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19 replies | 639 view(s)
01-11-2019,
02:49 AM
Bobby Bones
replied to a thread
"Strange" exam questions?
in
Geometry and Trig
Ok. Thanks. Will post each question in separate threads.
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2 replies | 310 view(s)
01-11-2019,
12:21 AM
Bobby Bones
started a thread
"Strange" exam questions?
in
Geometry and Trig
Hi, A student in Indonesia is about to start a Biomedical Engineering degree course at a Malaysian University. Unfortunately, the standard of...
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2 replies | 310 view(s)
01-10-2019,
11:56 PM
Bobby Bones
replied to a thread
What is the volume of this shape?
in
Geometry and Trig
As stated above, the sides don't look parallel. But if they are parallel, the volume = volume of a cylinder + half the volume of a sphere. The...
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3 replies | 287 view(s)
01-10-2019,
11:34 PM
Bobby Bones
replied to a thread
Solve: cos^−1(2x) + sin^−1(x) = π/3
in
Geometry and Trig
Beautiful work. You get your 4 marks. Btw, the exam paper has 7 questions in total and a 75 minute time limit. No beer allowed 😁
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19 replies | 639 view(s)
01-08-2019,
01:48 PM
Bobby Bones
replied to a thread
Solve: cos^−1(2x) + sin^−1(x) = π/3
in
Geometry and Trig
Thanks, you are right. I put my values for opp and hyp the wrong way round when i calculated sin(theta) from cos(theta)=2x. So what should I answer...
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19 replies | 639 view(s)
01-08-2019,
01:09 PM
Bobby Bones
replied to a thread
Solve: cos^−1(2x) + sin^−1(x) = π/3
in
Geometry and Trig
I get: 2x*√(1-x^2) - x/(√1-4x^2) = 1/2 I tried simplifying further by multiplying by 2 and by (√1-4x^2) but, I can't see a solution for x. I...
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19 replies | 639 view(s)
01-07-2019,
03:07 PM
Bobby Bones
replied to a thread
Solve: cos^−1(2x) + sin^−1(x) = π/3
in
Geometry and Trig
The equation is as given in the question. I haven't done anything as i don't know where to begin.
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19 replies | 639 view(s)
01-07-2019,
01:47 PM
Bobby Bones
started a thread
Solve: cos^−1(2x) + sin^−1(x) = π/3
in
Geometry and Trig
Solve: cos^−1(2x) + sin^−1(x) = π/3 I don't know where to begin with this one, other than π/3 = 60 degrees.
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19 replies | 639 view(s)
01-07-2019,
09:26 AM
Bobby Bones
replied to a thread
Differentiate sin(2x+y)
in
Geometry and Trig
Thank you.
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2 replies | 197 view(s)
01-07-2019,
06:16 AM
Bobby Bones
started a thread
Differentiate sin(2x+y)
in
Geometry and Trig
The question is: d sin(2x+y) dx How do I do this? The y in the equation is confusing me. I used the chain rule and got (dy/dx) = 2cos(2x+y)...
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2 replies | 197 view(s)
01-06-2019,
08:22 AM
Bobby Bones
replied to a thread
Using Hyperbolic functions, Solve sinh(2x) = 8cosh(x). Give answer in ln.
in
Geometry and Trig
Would you believe it? I've been looking for x all day and when I finally find it, his friend turns up too 😉 Thanks again.
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6 replies | 243 view(s)
01-06-2019,
04:11 AM
Bobby Bones
replied to a thread
Using Hyperbolic functions, Solve sinh(2x) = 8cosh(x). Give answer in ln.
in
Geometry and Trig
Thanks to both of you for your help. My final answer is x=ln(4x + sqrt(17))
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6 replies | 243 view(s)
01-05-2019,
06:07 PM
Bobby Bones
replied to a thread
Using Hyperbolic functions, Solve sinh(2x) = 8cosh(x). Give answer in ln.
in
Geometry and Trig
Could you please explain how to reached this step and how do I convert it to ln? I failed at factorizing it like a normal quadratic eqtn.
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6 replies | 243 view(s)
01-05-2019,
03:26 PM
Bobby Bones
replied to a thread
How to prove sin 45 = 1/root 2 and root 2/2 same?
in
Geometry and Trig
In degrees: sin45 = 1/sqrt2 (1*sqrt2)/(sqrt2*sqrt2) = sqrt2/2. When you multiply by any number divided by itself ( example 1/1 or 2/2 or...
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14 replies | 817 view(s)
01-05-2019,
03:12 PM
Bobby Bones
started a thread
Using Hyperbolic functions, Solve sinh(2x) = 8cosh(x). Give answer in ln.
in
Geometry and Trig
I have used 2sinhx.coshx = sinh(2x) 2sinhx.coshx = 8coshx Then divided by coshx: 2sinhx = 8 Divided by 2:
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6 replies | 243 view(s)
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"All mushrooms are edible, some are only edible once." Terry Pratchett
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