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4. Understanding the formulasPage 4Using the Sum and Difference formulas, we can easily get the Derived formulas. , if k is an odd integer, , if k is an even integer. Here T can be any trigonometric functions, and coT is the cofunction of function T. For example, sine and cosine are cofunctions of each other, similarly tangent and cotangent, secant and cosecant respectively. For example and so on, all of such formulas can proved by the Sum and Difference formulas: , since . since , and so on. In the same way we can prove all of them. 

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