Maths Olympiad Exam

Let R denote the set of all real numbers. Find all functions f : R → R satisfying the
condition
f(x + y) = f(x)f(y)f(xy)
for all x, y in R.

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Maths Olympiad Other Question

Let ABC be a triangle and D be the mid-point of side BC. Suppose DAB = BCA
and DAC = 15◦. Show that ADC is obtuse. Further, if O is the circumcentre of
ADC, prove that triangle AOD is equilateral.
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