Answer:
The cosine curve is a type of periodic curve that is commonly used in mathematics and physics. It is defined by the equation y=cos(x). The cosine curve is a smooth wave-like curve that has the same shape as the sine wave, but shifted by a quarter of a period. The cosine curve is used to describe cyclical phenomena, such as sound waves and light waves. In addition, it is used in trigonometry and calculus to solve complex problems.