Cosine Definition

\cos\theta = \frac{adjacent}{hypotenuse}

Description

Basic cosine ratio in a right triangle.

Variables

Symbol	Meaning
`θ`	Angle
`adjacent`	Side adjacent to angle
`hypotenuse`	Longest side

Example

Problem

Find cos(60°)

Solution

cos(60°) = 0.5

Real-World Applications

Wave analysis
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Engineering