Sec(a-b) = cos(a+b) / cos^2a - sin^2b I'm trying to prove this, by turning the left side into the right. I am stuck. Presumably you have already done the sum and difference formulas for sin and ...

Thus, although limitied in scope, this theorem prover can still prove a wide variety of trigonometric identities commonly found in textbooks. An example proof generated by this prover is shown below ...

Trigonometry, with its complex angles and functions, can be a challenging topic for both students and teachers. To ease this challenge, we’ve compiled a collection of highly effective trigonometry ...

There are some trigonometric identities which you must remember in order to simplify trigonometric expressions when required. When you are asked to prove something, ignore the right hand side of ...

By using the Law of Sines, and avoiding the Pythagorean theorem’s trig identity (sin²α + cos²α = 1), Johnson and Jackson successfully proved the theorem without resorting to circular reasoning.