Trick to Remember Formulae of Principal stress || Mechtrick 

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Trick/Shortcut to Remember Slope and Deflection: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-J22TSQ_GRQ8.html
Trick to Remember Iron-Iron Carbide Diagram: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-X9t6RFIiGWg.html
All Thermodynamic cycles: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-xW9CbL66cM0.html
Trick to remember elastic constant formula: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-4h_H7lZ79ao.html
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