cosα · ctgα + sinα = 1/sinα
L = cosα · ctgα + sinα = cosα · cosα/sinα + sinα = (cos²α + sin²α)/sinα = 1/sinα
sin²α + cos²α = 1
P = 1/sinα
L = P
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cosα · ctgα + sinα = 1/sinα
L = cosα · ctgα + sinα = cosα · cosα/sinα + sinα = (cos²α + sin²α)/sinα = 1/sinα
sin²α + cos²α = 1
P = 1/sinα
L = P