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Write a Python function find_duplicates(items1, items2) which takes
two lists of values as argument and returns a list containing all values which
were present in both lists.
The function must work both for lists of strings and list of integers.

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Priyanshu Patel
Priyanshu PatelLv10
21 Feb 2021

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Related questions

Assume that all of the functions are twice differentiable and the second derivatives are never 0.

If f and g are positive, increasing, concave upward functions on I, show that the product function f g is concave upward on I.

(b) Show that part (a) remains true if f and g are both decreasing.

(c) Suppose f is increasing and t is decreasing. Show, by giving three examples, that f g may be concave upward, concave downward, or linear. Why doesn’t the argument in parts (a) and (b) work in this case?

(a)

Given:

Functions f and g are positive, increasing, concave upward functions on I.

Hence,

Now,

Hence, the product function is concave upward.

(b)

When both the functions are decreasing and concave upward

Hence, the product function is concave upward.

(c)

When f is increasing and g is decreasing

can either positive or negative on I, depending on values of on I..

Hence, the product function may be concave upward, concave downward or linear.

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