Fundamentals of Trigonometry for Class 10
sine of ∠ A = side opposite to angle A/hypotenuse = BC/AC. cosine of ∠ A = side adjacent to angle A/hypotenuse = AB/AC. tangent of ∠ A = side opposite to angle A/side adjacent to angle A = BC/AB. cosecant of ∠ A = 1/sine of ∠A = AC/BC.
There are six functions of an angle commonly used in trigonometry.
Their names and abbreviations are sine (sin), cosine (cos), tangent (tan), cotangent (cot), secant (sec), and cosecant (csc).