Little Maths Game

[Mr.Dodo]

So lets play Maths game
Rules are simple you have to solve maths task written on previous post
and post new maths task bellow.
If sombody post wrong number, straighten it in your post.
Simple?
Try not to use calculator.

So lets start:
2 + 8 x 2 = ?

[lubbies]

18

5+9x9=

[Jerry]

86

d( ln(sin(x))/x^2 )/dx =
Given x = pi

[Vaderico]

^demolishes thread game^

[Tickles]

86

d( ln(sin(x))/x^2 )/dx =
Given x = pi

can we make it a rule that stuff this complicated is not allowed?

So I'm going to continue without answering this one.

51x283 (No Calculator)

[BlazingApollo]

14,433?

(1-¹/₂)(1-¹/₃)(1-¹/₄)(1-¹/₅).......(1-¹/₂₀) =

Seems complicated, but it's not, actually.

EDIT: Read as= (one minus 1/2)times(one minus 1/3)times(one minus 1/4) until (1 minus 1/20)
There's no power thingy

[Papi]

d( ln(sin(x))/x^2 )/dx =
Given x = pi

Sin(pi)=0, ln(0/pi^2)=ln(0)=impossible
 
No answer I think ;o

(1-1/2)(1-1/3)(1-1/4)(1-1/5).......(1-1/20) =

1/20?


4[squareroot(64)]+95x12.

[BlazingApollo]

(1-1/2)(1-1/3)(1-1/4)(1-1/5).......(1-1/20) =

1/20?


4[squareroot(64)]+95x12.

Correct sir!

Hmm, 32+1140= 1172?


1+1=

(-__-") run out of question....

[Arctus]

(1-1/2)(1-1/3)(1-1/4)(1-1/5).......(1-1/20) =

1/20?


4[squareroot(64)]+95x12.

Correct sir!

Hmm, 32+1140= 1172?


1+1=

(-__-") run out of question....

I believe that The answer to Papi's question is 9,772 due to 32 + (95 x 12) where 95 x 12 = 9740
And 1+1=2

Now Find the common ratio in this geometric sequence, and determine the next term:  3, 12, 48, 192,...
or you can multiply 20 by 342 for a different question.

Edit: I honestly don't know what i was thinking when i said 95x12 was 9740, it was an extremely stupid moment i'm not proud of.

[Shadowfred]

95x12 is 1140.

768 is the next term as 4 is the ratio.

20 x 342 = 6840

And for my question

13/7 + 5/11 = ?

[Jerry]

d( ln(sin(x))/x^2 )/dx =
Given x = pi

Sin(pi)=0, ln(0/pi^2)=ln(0)=impossible
 
No answer I think ;o

Well, you should be applying the value of x later, but well, I can't blame you either There is no definite answer, right!

First use the quotient rule;

d( ln(sin(x))/x^2 )/dx = (x^2 cos(x)/sin(x) - 2x ln(sin(x)) / x^4)

Simplify; (x^2 cos(x)/sin(x) - 2x ln(sin(x)) / x^4) = (x cos(x)/sin(x) - 2 ln(sin(x)) )/ x^3)

Then put x = pi;

(pi cos(pi)/sin(pi) - 2 ln (sin(pi)) ) / pi^3

\infty - 2(-\infty) / pi^3 = indefinite solution




13/7 + 5/11 = 1 (6/7) + 5/11 = 1 + (66+35)/77 = 1 + 101/77 = 2 24/77


Oh well. Another 'sequence';

3, 4, 6, 8, 12, 14, 18, 20, 24, 30, ?

[Arctus]

Is that the first 10 prime numbers +1, if so, then the next number would be 32.

Ummm. 5x2+3+7x0+12.5-1.

[Jerry]

5x2+3+7x0+12.5-1 = 10 + 3 + 0 + 12.5 - 1 = 24.5

Hmm, how about this one?
3, 3, 5, 4, 4, 3, 5, 5, 4, 3, 6, 6, ?

[Flynt]

5x2+3+7x0+12.5-1 = 10 + 3 + 0 + 12.5 - 1 = 24.5

Hmm, how about this one?
3, 3, 5, 4, 4, 3, 5, 5, 4, 3, 6, 6, ?

8.

[Mr Pokemon]

8=8?
You didn't give me a problem.
This shouldn't be too hard, just takes a little bit of time.
Domain of f(g(h(x))) given f(x)=(9^1/2)/(2x-2)  g(x)=-5x^1/2  and f(x)=(128x^1/7)+3