IIT-JEE Exam

If the angle A, B and C of the triangle are in the an arithmetic progression and if a, b and c denote the
lengths of the sides opposite to A, B and C respectively, then the value of the expression a/c(sin 2C)+ c/a(sin 2A) is

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IIT-JEE Other Question

The total number of cyclic isomers possible for a hydrocarbon with the molecular formula C4H6 is Let P, Q, R and S be the points on the plane with position vectors –2 ˆi −ˆj, 4ˆi,3ˆi + 3ˆj and −3ˆi + 2ˆj
respectively. The quadrilateral PQRS must be a
(A) parallelogram, which is neither a rhombus nor a rectangle
(B) square (C) rectangle, but not a square
(D) rhombus, but not a square