The expression tan(θ/2) refers to the tangent of half an angle θ, and it plays a significant role in trigonometry, particularly in the context of half-angle identities. This expression allows for the simplification and calculation of trigonometric functions of angles that are halved, which is especially useful for solving equations and analyzing triangles. Using half-angle identities, one can derive relationships involving sine and cosine that aid in understanding angles in various applications.
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