Trigonometric Identities trig identities cheat sheet

What are the fundamental trigonometry identities? The six trigonometric functions are sine, cosine, secant, co-secant, tangent and co-tangent.By using a right-angled triangle as a reference, the trigonometric functions or identities are derived:īelow is the table for trigonometry formulas for angles that are commonly used for solving problems. Since the hypotenuse is the longest side in a right triangle, the value of sin A or cos A is always less than 1 (or, in particular, equal to 1)īasic Formulas There are basically 6 ratios used for finding the elements in Trigonometry.The values of the trigonometric ratios of an angle do not vary with the lengths of the sides of the triangle, if the angle remains the same.

Each trigonometric ratio is a real number and has no unit.Side AB is called the side opposite to angle C.Side BC is called the side adjacent to angle C.Side BC is called the side opposite to angle A or perpendicular.Side AB is called the side adjacent to angle A or base.Side AC is called the hypotenuse of the right angle.The word “trigonometry” is derived from the Greek words “tri” (meaning three), “gon”(meaning sides) and “metron”(meaning measure) Right angled triangle ABC Trigonometry is the study of relationships between the sides and angles of a triangle The three sides of a right-angled triangle give six trigonometrical ratios namely sine, cosine, tangent, cotangent, secant, and cosecant. The ratio between the lengths of a pair of two sides of a right-angled triangle is called a Trigonometrical Ratio.

Trigonometric Identities trig identities cheat sheet