uzasadnij tożsamość: cos\alpha* ctg \alpha+ sin\alpha= 1/ sin\alpha
cosα · ctgα + sinα = 1/sinα
L = cosα · cosα/sinα + sinα = (cos²+ sin²α)/sinα = 1/sinα
P = 1/sinα
L = P
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cosα · ctgα + sinα = 1/sinα
L = cosα · cosα/sinα + sinα = (cos²+ sin²α)/sinα = 1/sinα
P = 1/sinα
L = P