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(in a right-angled triangle) the ratio of the side (other than the hypotenuse) adjacent to a particular acute angle to the side opposite the angle.
‘Since we want the cotangent, just take the reciprocal to solve.’
‘I can't tell the difference between radians, tangents, cotangents, secants, etc.’
‘If the tangent of an angle is a/b then the cotangent of that angle is b/a.’
‘The tangent and cotangent came via a different route from the chord approach of the sine.’
‘The first tabulates logarithms of the sine, cosine, tangent and cotangent functions at 1 intervals and shows how to solve triangles using logarithmic functions.’