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#326 Help Me ! » f (x) » 2007-09-04 09:39:24
- tony123
- Replies: 1
f (x) function from z to z
x is integer
f(3)=70, f(4)=180,f(5)=470, f(6)=1230
find f(x)
#327 Help Me ! » x is integer » 2007-08-31 10:07:00
- tony123
- Replies: 2
if x is integer
find all integer x
such that
9x^2+160x+800
is a perfect squer
#328 Re: Help Me ! » 90° » 2007-08-28 23:03:07
Consider five points A, B, C, D and E such that ABCD is a
parallelogram and BCED is a cyclic quadrilateral. Let ℓ be a line passing
through A. Suppose that ℓ intersects the interior of the segment DC at F
and intersects line BC at G. Suppose also that EF = EG = EC. Prove
that ℓ is the bisector of angle DAB
#329 Help Me ! » 90° » 2007-08-26 23:02:57
- tony123
- Replies: 2
ABCD a parallelogram and BCED a cyclic quadrilateral , AN stret line cut interior segment CD in M and stret line BC in N ,let ME=NE=CE
show that the m(angle) betwen AN and CE = 90°
#330 Help Me ! » sin(x radians) = sin(x degrees) » 2007-08-21 03:18:19
- tony123
- Replies: 3
Find all real numbers x such that
Repeat for. cos x and tan x.
#331 Help Me ! » solve » 2007-08-19 21:34:48
- tony123
- Replies: 5
#332 Help Me ! » inte » 2007-08-13 07:03:09
- tony123
- Replies: 1
#333 Help Me ! » triangle » 2007-08-13 03:01:40
- tony123
- Replies: 1
triangle ABC the bisector of angle A cuts BC in D show that
#334 Help Me ! » a triangle » 2007-08-06 13:25:16
- tony123
- Replies: 4
Prove the following: if, in a triangle ABC, BA =CB
O in atriangle
< BAO = < OAC = 20°,
< ACO = 10°,
and < OCB = 30°,
then< OBC = 80°.
#335 Help Me ! » prove » 2007-08-05 13:19:13
- tony123
- Replies: 5
#336 Help Me ! » geometric mean -1/2 » 2007-08-05 07:49:16
- tony123
- Replies: 1
Prove that the three numbers cos40°, cos80° and cos160° have arithmetic mean 0, harmonic mean 1/2 and geometric mean -1/2.
#337 Help Me ! » find x » 2007-08-04 03:30:37
- tony123
- Replies: 4
#338 Help Me ! » how » 2007-08-03 04:31:11
- tony123
- Replies: 1
please some one tell me how
integral ∫1/(4 + 5 ( cos x )^2 ) dx= (1/6)tan-¹[(2tanx)/3] + c