Ekhane angle gula kivabe nise ektu explain korte parben? Chitro dekhe kisu bujhtesina. Ami 4cos0+3cos60+6cos120=Rcosθ evabe korsilam evabe kano hoilona?

Optimus Prime

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Ekhane angle gula kivabe nise ektu explain korte parben? Chitro dekhe kisu bujhtesina. Ami 4cos0+3cos60+6cos120=Rcosθ evabe korsilam evabe kano hoilona? question

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