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5sin11п/12*cos11п/12 

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Deep in a lonely forest there once lived a woodcutter. One day the woodcutter was cutting down trees, when he heard a cry of a bird. He wondered what had happened and went to look at the bird. Under a big green bush he saw a nest that had been built by a bird, with many eggs inside it. A great snake prepared to kill the mother bird, who bravely was defending her nest. The woodcutter stroke the snake with the stick that he had found in the forest and killed it. Some years after this, the woodcutter one day set out on a journey. He was walking along a lonely mountain path, hungry and tired, when night fell. Suddenly, he saw a light in the woods. He went toward this light and came to a large beautiful house that had been built in the middle of the wood by some mysterious people. The woodcutter was surprised as he didn't expect to find such a fine house so deep in the forest. He knocked on the door, and a beautiful young woman came out.

В равнобедренном треугольнике ABC угол при вершине В раверно 120 градусов, боковая сторона равно 4. Найдите основание АС.

Энергия электрического поля конденсатора - ....

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