Definitions-Trigonometric Ratios

Definitions of trigonometric ratios

Definitions of trigonometric ratios of angle (angle A) in a triangle (triangle ABC) right angled at (angle B)

sine of (angle A) = sin(A) = (text{side opposite to } angle A over text{hypotenuse}) = (BC over AC)

cosine of (angle A) = cos(A) = (text{side adjacent to } angle A over text{hypotenuse}) = (AB over AC)

tangent of (angle A) = tan (A) = (text{side opposite to } angle A over text{side adjacent to }angle A ) = (BC over AB)

cosecant of (angle A) = cosec (A) = (1 over sin A) = (ACover BC)

secant of (angle A) = sec (A) = (1 over cos A) = (ACover AB)

cotangent of (angle A) = cot (A) = (1 over tan A) = (ABover BC)