اکنون در دسترس! پژوهش تلگرام ۲۰۲۵ — مهمترین بینشهای سال 
Maths Olympiad Daily Problems
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This channel is created for maths lovers and maths Olympiad aspirants who loves to solve daily some good level of thinking problems in maths.also we discuss those problems https://t.me/mathproblemsdiscussiongroup and we can send our doubts in maths.
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Let P be point on side ab in triangle ABC such that AP equal 3pv let Q belongs to C such that aq equal 4 QC prove that BQ bisects a line segment CD
Screenshot_2026_04_18_22_30_20_78_40deb401b9ffe8e1df2f1cc5ba480b12.jpg0.35 KB
Also complex combinatorics chapter of PFTB by Titu also contains a similar technique on a much advanced level.
https://artofproblemsolving.com/community/c1340h1003741_roots_of_unity_filter?srsltid=AfmBOorqieGq3_0zK4dEaBS31oVc8wpkdvZgYViAr2pv-_zijU6KECtR
Roots of unity filter
Also read Evan Chen summations handout for more information
