Trigonometry functions are mathematical equations used to calculate angles and lengths of triangles. Cosecant is an 8 letter trigonometry function that is the reciprocal of the SINE function. SECANT is a 6 letter trigonometry function that is the reciprocal of the COSINE function. Arctangent is a 10 letter trigonometry function that is the inverse of the tangent function. Cosec is a 5 letter trigonometry function that is the reciprocal of the COSINE function. SINE is a 4 letter trigonometry function that is the ratio of the side opposite the angle to the hypotenuse of a right triangle. COSINE is a 6 letter trigonometry function that is the ratio of the adjacent side to the hypotenuse of a right triangle.