For △ABC, cosθ =

Explanation:

Trigonometric functions:

• Trigonometric functions also known as circular functions can be simply defined as the functions of an angle of a triangle.
• It means that the relationship between the angles and sides of a triangle is given by these trigonometric functions.
• The basic trigonometric functions are sine, cosine, tangent, cotangent, secant, and cosecant.

Cos θ:

• The Cos θ is the ratio of the adjacent side to the hypotenuse, where θ is one of the acute angles.

Cos θ = \(\frac{BC}{AB}\)

Additional InformationSin θ:

• The Sin θ is the ratio of the opposite side to the hypotenuse.

Sin θ = \(\frac{AC}{AB}\)

Tan θ:

• The Tan θ is the ratio of the opposite side to the adjacent side.

Tan θ = \(\frac{AC}{BC}\)