Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
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Find sin(x/2), cos2x, and sin3x, when Cotx=(-1/2), cosx<0
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2
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3K
Timcago
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T
Find Sin3x, x in QII, given that Cscx = 5/3
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2
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2K
Timcago
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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
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1K
pka
pka
C
A Very Difficult Question
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1
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1K
stapel
stapel
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Coordinate Geometry
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3
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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
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2K
stapel
stapel
T
I have no idea: Name the property that justifies....
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2
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2K
pka
pka
T
trig: C = 66° 34', a = 407, b = 513
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3
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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
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2K
pka
pka
G
Tangent lines, circle equations, centers, and radii
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2
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4K
soroban
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M
DC and BC are tangents; classify the triangle
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2
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2K
Mrspi
M
T
Wikipedia Law of Sines Question
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1
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2K
JakeD
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S
Using A^-1 to solve system of linear equations in form Ax=b
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3
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2K
sigma
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M
Finding the angle, given that the two lines are parallel
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2
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2K
jonboy
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J
Determining if ball reached forward.
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2
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2K
jonboy
J
S
Elementary matrices: find E such that EA = B for....
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8
Views
13K
galactus
G
M
cosine: if z = 1/z = 2 cos 3°, then show that z + 1/z =....
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2
Views
31K
malick
M
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