Предмет: Математика, автор: ilona3759

3cos x - sinx = 2 cos 3x

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Автор ответа: zxcanimka

0

Пошаговое объяснение:

на скрине..................

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In the 21st century, our need for energy is greater than it has ever been. Fossil fuels like coal, oil and gas were formed of years ago, and when power station burn them to create electricity, they release harmful gases into the atmosphere. There may be enough coal to last for a few hundred years, but known oil and gas reserves will run out in less than 50 years – and then what will we do?
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