Learn how to use the Pythagoras Theorem and other identities to simplify and calculate trigonometric functions such as sine, cosine and tangent. See examples, diagrams and formulas for right triangles, cosecants, secants, cotangents and more. Learn how to use sin, cos, and tan to find the missing sides or angles of a right-angled triangle using formulas, values, and tables. Explore the acronym "SOHCAHTOA", the unit circle, and the applications of sin cos tan in real life. Learn how to use sine, cosine and tangent functions to find angles and distances in right-angled triangles and other triangles. See examples, graphs, calculators and links to more topics on trigonometry. We know that sin, cos, and tan are the reciprocals of cosec (or csc), sec, and cot functions. Thus, we can derive 3 more formulas related to sin, cos, and tan. sin A = 1/csc A (or) csc A = 1/ sin A. cos A = 1/sec A (or) sec A = 1/cos A. tan A = 1/cot A (or) cot A = 1/tan A. Learn how to find sin cos tan values for any angle using formulas, table and examples. Find out the trigonometric ratios of sine, cosine, tangent, cotangent, secant and cosecant for different angles. See how to use the formulas and the chart to solve problems involving sin cos tan values. While sine and cosine are readily identifiable as the projections of the radius on the vertical and horizontal axis, we need to see the definition of the tangent to understand how to find it and visualize it: \tan (\alpha) = \frac {\sin (\alpha)} {\cos (\alpha)} tan(α) = cos(α)sin(α) Learn the basic and Pythagorean identities for trigonometric functions, such as sin, cos, tan, cot, sec and csc. Find out how to use them to simplify expressions, calculate angles and solve equations. See examples, formulas and diagrams. Trigonometric relationships are very important in the construction and planning industry and allow precise calculation of unknown lengths and angles. Part of Maths Numeracy (WJEC) Geometry and kAWreNi.