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_____________ = sinα *cosα
tgα+ctgα
1
___________________=sinα*cosα
sinα/cosα+cosα/sinα
1
______________________=sinα*cosα
(sin²α+cos²α)/sinα*cosα
1
___________=sinα*cosα
1/sinα*cosα
1*(sinα*cosα)/1=sinα*cosα
sinα*cosα=sinα*cosα
L=P