TRIGONOMETRY COMPOUND ANGLES PART   1
Channel: Sakala Vidya
Date: 2016-07-19

https://youtu.be/-RE11KKhrBI
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Please watch: "Tips & Tricks |How to crack a |math problem| in |30 seconds| part 2|" 
https://www.youtube.com/watch?v=6fl9zmWJp1E
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