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Find the area of the purple shaded region

Find the area of the purple shaded region. Express result to the accuracy of 3 decimal.

Correct answers: 45

The first user who solved this task is Sanja Šabović.

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Ugliest baby

A woman gets on a bus with her baby. The bus driver says: ''Ugh, that's the ugliest baby I've ever seen!'' The woman walks to the rear of the bus and sits down, fuming. She says to a man next to her: ''The driver just insulted me!''
The man says: ''You go up there and tell him off. Go on, I'll hold your monkey for you.''

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Vito Volterra

Died 11 Oct 1940 at age 80 (born 3 May 1860).Italian mathematician who made important contributions to calculus, and mathematical theories in astronomy, elasticity and biometrics. His mathematical talent appeared as a young boy. In 1905, he began to develop the theory of dislocations in crystals that led to improved understanding of the behaviour of ductile materials. During WWI he established the Italian Office of War Inventions and designed weapons for use by airships, for which he proposed the use of helium instead of flammable hydrogen. He is remembered for achievements in function theory and differential equations. In biology, in 1925, he formulated a pair of differential equations relating populations of prey and predators (also independently proposed by Alfred J. Lotka in 1925).«

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