Mathematics - 3 November 2007

how do i convert (-135 degrees) to radians using a calculator?

2007-11-03 23:53:46 · 4 answers · asked by SeXxY&SmArT 2

Then, dx/dt = -3/t^2.

The integral of 1/(9+x^2) dx = the integral of (-3/t^2)/(9+(3/t)^2) dt = (-1/3)*the integral of 1/(1+t^2) dt = (-1/3)*arctan(t) + C = (-1/3)*arctan(3/x) + C.

I know we can just derive the integral using the formula for the derivative of tangent inverse. But will this substitution work? Is it correct?

Thanks!

2007-11-03 21:53:39 · 2 answers · asked by Anonymous

what is the easy way or technique in proving trigonometric identities?
ex. 1-cos/1-sin=tan

2007-11-03 21:49:40 · 5 answers · asked by Anonymous

the remaining 1 question has 5 possible answers. What will be the total number of possible answers?

2007-11-03 21:37:37 · 5 answers · asked by raj 7

http://i106.photobucket.com/albums/m273/starrynight_03/trigchartcopy.jpg

help me to fill in the blanks of the table, i seemed to have gotten everything right except for the ones in blue, can u tell me what the sec theta, csc theta, etc equals when its at that certain radian and degree?

please help, i need this chart completed in order to do my homework assignment because i need to use these identities.

10 POINTS TO WHOEVER HELPS ME FILL IN THE BLANKS!!

2007-11-03 21:32:09 · 14 answers · asked by Anonymous

2007-11-03 21:26:39 · 7 answers · asked by Kylie D 1

Could anyone please explain how to figure it out? I would appreciate it. Thanks.

2007-11-03 21:10:19 · 7 answers · asked by Jay 1

why limf(x)^g(x)=1^infinity is e^lim[f(x)-1]*g(x) ????????

2007-11-03 20:42:20 · 2 answers · asked by Anonymous

I am supposed to prove this is a divergent series. I'm trying to apply the Integral Test. I think the function is positive, continuous and decreasing on x > or equal to 1, but I can't integrate this. Please help me find the anti-derivative of:

1/(1 + 2ln(x))

When you have an infinite series like this, can you compare logarithms using a direct comparison or limit comparison?

2007-11-03 20:36:12 · 2 answers · asked by Anonymous

2007-11-03 20:29:15 · 4 answers · asked by Anonymous

2007-11-03 19:44:41 · 4 answers · asked by nagaraja g 1

use addition method

2007-11-03 19:34:50 · 3 answers · asked by Mary L 2

prime numbers?
Is 1,2,3,4 prime numbers?

2007-11-03 19:13:15 · 5 answers · asked by Anonymous

In simplest form.

2007-11-03 19:07:10 · 8 answers · asked by Anonymous

A ladder 15ft long rests against a vertical wall. If the bottom of the ladder slides away from the wall @ a rate of 3 ft/s, how fast is the top of the ladder sliding down the wall when the bottom of the ladder is 6ft from the wall.

2007-11-03 19:06:15 · 3 answers · asked by Vicky 2

2007-11-03 19:00:13 · 6 answers · asked by Vicky 2

Hey, i have done some factoring but i came across one that is not like the others. I've seen this a couple of times before and i ran through my notes a few times because i thought i copied it down but it appears i had not. If you can factor this one out for me, i can use it as a template for the rest. Thanks for your help.

r^2+4rs+4s^2

2007-11-03 18:58:09 · 8 answers · asked by basketcase 2

2007-11-03 18:56:58 · 8 answers · asked by joeycarino4 1

What is the solution?
What is the answer for:
8/(log_3 x^2) - 1/(log_x 3)=3

Note that log_3 x^2 means log that have base 3

2007-11-03 18:36:32 · 5 answers · asked by A A 1

1. What is the y-intercept of y = cos x?

2. Find the amplitude of y = -2cos (4x - pi).

Could someone please explain these? Thanks.

2007-11-03 18:25:33 · 9 answers · asked by labelapark 6

1. Find the period of y = -2 sin (8x + pi/2)

2. Find the period of y = 9/8 sin (- (8 pi x) / 3 )

Could someone please explain these questions? Thanks.

2007-11-03 18:17:40 · 2 answers · asked by labelapark 6

2007-11-03 18:14:45 · 6 answers · asked by Anonymous

How do I find csc theta given that (9,12) is a point on the terminal side of the angle theta?

How do I do this? Thanks.

2007-11-03 18:06:21 · 1 answers · asked by labelapark 6

How do you slove this???
lg(2x)-3lg2=(1/2)lg(x-3)

lg means log with base 10

2007-11-03 17:52:59 · 3 answers · asked by A A 1

In a thunder and lightning storm there is a rule of thumb that many people follow. After seeing the lightning, count seconds to yourself. If it takes 5 seconds for the sound of thunder to reach you, then the lightning bolt was one mile away from you. Sound travels at a speed of 331 meters/second. How accurate is the rule of thumb? Express your answer as a precent error.

I this is for my stupid problem solving class that I HATE. If you solve it, you will be my hero and I will love you forever.

2007-11-03 17:37:15 · 7 answers · asked by dramastar_nsf 2

find the first partial with respect to x of f(x,y,z) = z - sqrt(x^2-y^2), I don't see how the first partial is -x/2, i get -x/sqrt(x^2+y^2) what am I doing wrong?

2007-11-03 17:33:08 · 4 answers · asked by Anonymous

Prove that , if lim x = k , lim x' = k' ,then lim (x-x') = k-k' , lim(x*x') =k*k' , and if k' ≠0 , lim(x/x') = k/k'

2007-11-03 17:21:47 · 3 answers · asked by Anonymous

For the function f(x)=sqr root (x) we know f(4)=2 and f(9)=3.
(a) Use linear interpolation to find sqr root of 5
(b) Find the error to 3 decimal places using a calculator or sqr root table.
(c) What is the percentage error? (Recall that percentage error is 100*error/(exact answer).)

Thanks for the help...I think I got a and b but even with the formula laid out I can't seem to get c. So I figure maybe I better see the whole thing worked out.

2007-11-03 17:19:18 · 4 answers · asked by Mia 1

Prove that , if a and b are real numbers :
││a│-│b││≦│a-b│≦│a│+│b│

2007-11-03 17:13:31 · 1 answers · asked by Anonymous

Given any rational number a and for any positive rational number ε , we can always find another rational number b such that │a-b│< ε .

2007-11-03 17:04:37 · 2 answers · asked by Anonymous