Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
doughishere
Inverse Fcns: For f(x) = 1/(3x + 2), f^(-1)(x) = (1 - 2x)/(3x), show f(f^(-1)(x)) = x
Replies
2
Views
1K
doughishere
doughishere
K
Pythagoras' theorem questions
Replies
2
Views
2K
KMCC
K
W
Mechanics on static particles - where did i go wrong?
Replies
0
Views
968
wduk
W
M
Prove truth of circle division theory by 5 equal parts
Replies
2
Views
2K
JeffM
J
D
Angular Sizing with Reference Objects in Image
Replies
8
Views
3K
mmm4444bot
mmm4444bot
saurabh
length of segment in parallelogram: BC = 4 cm , CD = 9 cm then what is AP ?
Replies
2
Views
2K
saurabh
saurabh
A
Exception to the Reflexive Property of Equality
Replies
17
Views
6K
austint
A
R
Verifying Trig Identites: (cos(a)+cos(b))^2 + (sin(a)-sin(b))^2 = 2+2cos(a+b) and...
Replies
7
Views
3K
Dr.Peterson
Dr.Peterson
S
Area of a right angled triangle missing height.
Replies
2
Views
1K
SaltyPoro
S
E
how many 26 degree agles in a 2017 corner
Replies
8
Views
2K
enoimreh7
E
P
Double-, Half-Angle Idents: If tan(pi/8)=sqrt{A}-B, find A,B using half-angle ident.
Replies
2
Views
2K
stapel
stapel
L
Need help for my precal HW: tan(t) = -1/√(3), 2(sin(x))^2 - 5(cos(x)) - 4 = 0
Replies
3
Views
2K
stapel
stapel
K
Exercise with angle bisector: find x1, x2 explicitly as function of L, D and alpha
Replies
3
Views
2K
mmm4444bot
mmm4444bot
R
Trig Question Dealing with Sum, Difference, Double Angle, and Half Angle Formulas
Replies
2
Views
1K
rojareina
R
L
Precalc: Solve 2sinx^(2 ) - 5cosx - 4 = 0, 2cosx^(2) = 3sinx + 3
Replies
2
Views
1K
Dr.Peterson
Dr.Peterson
K
Parallel lines and congruent segments question
Replies
4
Views
2K
stapel
stapel
C
Christmas tree cone covered with Baci chocolates - How many chocolates?
Replies
2
Views
1K
stapel
stapel
R
Proving trig identities: cos(g+h)cos(g-h) = cos^2(g)-cos^2(h)
Replies
3
Views
2K
mmm4444bot
mmm4444bot
D
Triangulation Question: bearing, elevation angles from 2 observers
Replies
7
Views
5K
DoingMathMe
D
M
[Linear Algebra] Matrix "proof" type problem involving determinants ( I think)
Replies
1
Views
1K
barrick
B
You must log in or register to post here.
Top