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1.is sin C = cos A in a right angled isosceles triangle ABC where angleB = 90 degrees explain with reason

2.D and E are two points on side AB and BC of a ABC is DE // AC if DB=4,DA=2,BE=6,EC=3 ? explain with proper reason

1
by 012345

cosC = AC/AB

so sinC=cosA

2. BDE and BAC are similar.. from there, you can find EC=3