62
Lokesh Verma
·2009-01-12 22:04:52
Hint: Think of the proof of Tan (A+B)
33
Abhishek Priyam
·2009-01-14 03:45:09
@ adityak
Post questions in separate posts ...
1
adityak
·2009-01-14 01:35:40
solve this sum
if
tan(45+y/2)=(tan(45+x/2)3
then prove that
siny/sinx=3+sin2x/1+3sin2x
33
Abhishek Priyam
·2009-01-12 22:14:02
Yes it is indeterminate but zero ...in lay man terms also
because in denominator theres ∞2
and numerator ∞
and both 'similar infinity'
13
MAK
·2009-01-12 22:11:30
Tan(A+B) = (SinA.CosB+CosA.SinB) / (CosA.CosB-SinA.SinB)
now dividing it by CosA.CosB in numerator n denominator, we get .........(#)
Tan(A+B) = (TanA + TanB) / (1-TanA.TanB)
here... observe d statement (#)... we can divide d expression wid CosA.CosB provided neither A nor B is equal to (2n+1)Î /2 ...
hence we cannot use dat formula for d case when A=B=(2n+1)Î /2 ...
[1]
62
Lokesh Verma
·2009-01-12 22:10:23
are u trying to put ∞ in this formula
2∞/1-∞2
this is also zero then..
there is a slight mistake here....
1) THis is not zero.. this is indeterminate... (infinity by infinity can take any value)
2) THe limit as you take a to pi/2 will be zero..
3
msp
·2009-01-12 22:10:20
ok tx philip.i thought that it shud be infinity.so i opposed priyam.however its cleared now.
3
msp
·2009-01-12 22:05:48
small doubt priyam wat is -1/∞
1
Philip Calvert
·2009-01-12 21:45:50
didn't get ques very clearly what is meant by formulae[7]
33
Abhishek Priyam
·2009-01-12 22:04:10
where... those formulas are for reals...
But as i have said mathematics don't capture infinity but gives a hint if can understand it else ∞ is bakwaas in the eyes of our mathematics..
3
msp
·2009-01-12 21:59:48
but the formula says that it should be a negative quantity......
3
msp
·2009-01-12 21:56:18
it should not be zero.it should bea negative quantity
33
Abhishek Priyam
·2009-01-12 21:54:04
in numerator and denominator both reaches ∞ with same nature (both due to tan as x→pi/2) and in denominator power of ∞ is higher :P so zero
33
Abhishek Priyam
·2009-01-12 21:52:38
;)
are u trying to put ∞ in this formula
2∞/1-∞2
this is also zero then..
1
kishan nageswaran
·2009-01-12 21:49:39
tan(a+b) =(tan a +tan b)/(1-tanAtanB)