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Trigo-2007-41, cosine

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작성자: komath

라벨: inequality, problem, triangle, Trigonometry

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<Solid-2025-261 >, hint Let P on AB, Q on BC, R on,CD, S on DA such that PQRS is a rhombus. For PS//QR, PQ//SR, AP/PB=x/(1-x), ...
Trigo-2007-69, tan

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<Tri-2025-2225>, hint On line BC, MD extended intersect line BC at E. Draw a line , parallel to MDE, cutting line BCE at F. Triangles ...
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<Tri-2025-2270>, general, tangent <Russia Regional Olympiad 2003>
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<Solid-2025-258>, hint Since MN is perpendicular to AB, CD, Triangle NBA , MDC are isosceles , and so NA=NB, MC=MD. Triangles CBD , CA...
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<Tri-2024-2117>, hint Let M be the midpoint of AB, O be the circumcenter of triangle ABC. Construct the circumcircle w of triangle AO...
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<Tri-2025-2189>, hint
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<Tri-2025-2226>, general, bisector <Romania District Olympiad 2005>
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<Tri-2025-2217>, hint Consider Simson Line. Suppose M on arc AC and let N'. P', Q' be the projections of M onto lines AB, ...
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<Qua-2024-729>, similar, parallelogram <Mexico regional O. 2012>

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Trigo-2007-41, cosine

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