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Where does $\sin 3° =3\sin 1° -4 \sin^3 1°$ come from?

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#algebra-precalculus #trigonometry #triangles
230
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find angle in triangle

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#geometry #circles #triangles
128
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find parameter for maximize area

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#trigonometry #triangles #coordinate-systems
4.8k
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Altitudes Ratio

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#triangles
1.1k
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Nature of a triangle with vertices $z_1, z_2$ and $-1$ such that $|z_1|=|z_2|=1=z_1+z_2$

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#geometry #triangles
1k
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Fitting circle into an angle

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#geometry #circles #triangles
1.7k
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word problem about right-angle triangle

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#trigonometry #triangles
345
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Triangle of Multinomial Coefficients

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#sequences-and-series #definition #triangles #multinomial-coefficients #oeis
1.3k
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Properties of Triangle - Trigo Problem : In $\triangle $ABC prove that $a\cos(C+\theta) +c\cos(A-\theta) = b\cos\theta$

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#trigonometry #triangles
743
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How to be good at angles and trigonometry

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#reference-request #trigonometry #soft-question #triangles
228
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Calculate angle in triangle having 2 points and two lines

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#geometry #triangles
396
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Use of triangle inequality for 2 triangles

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#geometry #triangles #triangulation
3.3k
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Prove that the centre of the nine-point circle lies on the midpoint of the Euler line

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#geometry #circles #triangles
21.5k
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Do two right triangles with the same length hypotenuse have the same area?

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#geometry #triangles #area
396
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Triangle inequality for an obtuse triangle

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#geometry #triangles #euclidean-geometry

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