Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
F
I have to verify these identities: sin(x + y + z) = ...
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3
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9K
pka
pka
T
cosine anyone? if cos(54°) = 0.5878, then arccos(0.15878) =?
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2
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10K
soroban
S
T
Optimum Straight Line: calculating 'best fit' for points
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6
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3K
JakeD
J
M
ABCD is a quadrilateral inscribed in a circle. If m(A) =....
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4
Views
3K
Mathisconfusing101
M
T
Bearing question: how far is plane when error is noticed?
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1
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2K
galactus
G
T
Exact value of csc(sin^-1(2/5)+tan^-1(1/3))
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1
Views
4K
soroban
S
G
Double Angle Question
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1
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2K
Mrspi
M
G
cos 1/2x same as cos x/2?
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2
Views
2K
Guest
G
T
Find sin(x/2), cos2x, and sin3x, when Cotx=(-1/2), cosx<0
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2
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3K
Timcago
T
T
Find Sin3x, x in QII, given that Cscx = 5/3
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2
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2K
Timcago
T
T
Verify This identitiy: sin(x + y + z) = sinxcosycosz +....
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1
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2K
pka
pka
G
prove 2 views are enough to show parallelism b/t 2 lines
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3
Views
1K
pka
pka
C
A Very Difficult Question
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1
Views
1K
stapel
stapel
L
Coordinate Geometry
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3
Views
2K
lydia2468
L
M
The measure of a chord/arc
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2
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2K
Mathisconfusing101
M
G
trig identities: sin^2(x) + cos^2(x) = 1, sin(2x) = ....
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2
Views
2K
stapel
stapel
T
I have no idea: Name the property that justifies....
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2
Views
2K
pka
pka
T
trig: C = 66° 34', a = 407, b = 513
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3
Views
14K
stapel
stapel
S
Provide an example for the following 3x3 matrix
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5
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9K
galactus
G
M
oops.
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3
Views
2K
pka
pka
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