Question

Determine x in the given equation....

Answer 1

arctan(x+1) + arctan(x-1) = 12

Answer 2

let A = arctan(x+1)
B = arctan(x-1)

Answer 3

Tan A + Tan B= arctan 12

Answer 4

I think it's right

Answer 5

arctan 12 = 85.236 degrees

Answer 6

Ah?

Answer 7

I mean you still have determine x.....

Answer 8

It says here it somehow uses the quadratic formula here

Answer 9

yeah...?

Answer 10

Hey I don't know much about this topic, so here's a video which will make you understand that better
https://www.youtube.com/watch?v=QQS10SQr8jU

Answer 11

Really? Thanks
:)

Answer 12

You're welcome :)
This topic has not been discussed yet... We will probably learn this next year or later, so can't tell now or I will go wrong.

Answer 13

I'm sorry I couldn't help much.

Answer 14

This will probably help you --- http://math2.org/math/integrals/tableof.htm

Answer 15

@terenzreignz plz help

Answer 16

not sure of myself...
is there are two solutions of x ...
\[x \approx -9.28775\]
and
\[x = 7.29690\]
?
@EngrChong

Answer 17

How?

Answer 18

is that the correct answer?

Answer 19

I thought they supposed to be in fractions?

Answer 20

you can do express them in the form of fraction(just usethe rational->fractional method)

Answer 21

I think they're wrong...

Answer 22

x1= 4/3
x2=-3/2

Answer 23

uh..this might help:

http://en.wikipedia.org/wiki/Inverse_trigonometric_functions#Relationships_among_the_inverse_trigonometric_functions

Answer 24

My head might explode on that...

Answer 25

have you read that before commenting?

Answer 26

I already saw the site....

Answer 27

have you read that?

Answer 28

http://upload.wikimedia.org/math/e/e/1/ee18cbc65ed818a0da9323e4276a7eff.png

Answer 29

^thats the key

Answer 30

Really?

Answer 31

not a key but a roadmap(my intuition is saying that)