Trigonometric functions are often referred to as circular functions. This is because these functions are closely related to the geometry of circles and triangles. The six primary trigonometric functions are sine (sin), cosine (cos), tangent (tan), cosecant (csc), secant (sec), and cotangent (cot). They describe the ratios between the sides of a right triangle in relation to its angles. Trigonometric functions have numerous applications in mathematics, physics, engineering, and various other fields.
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The tangent and cotangent functions.
The trigonometric functions are sine, cosine and tangent along with their reciprocals and the inverses. Whether the angle is acute or obtuse (or reflex) makes no difference).
Tangent and cotangent positive; other 4 negative.
just an angle, like any other angle.
Use the trigonometric relations and identities.