Rich trigonometry techniques

In procedural approach to solve Trigonometry or Algebra problems, usually the student has to go through many steps writing the steps using pen and paper without using the useful patterns lying partly hidden in the problem waiting to be used with intelligence so that the solution is reached in a few steps lightning fast, that too without using pen and paper. We are not discussing tricks. We are discussing the anatomy of a rich concept that are based on basic concepts and how a specific rich concept can be used for what we call, efficient problem solving.

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Trigonometry high level questions solved SSC CGL Set 40: Learn all the tricks and techniques to solve the 10 difficult trigonometry questions in 12 mins.