sin α 1
Ctg α+-------- = ........
1+cos α sin α
sin a 1
ctg a + ---------- = -------
1+cos a sin a
sin a
L = ctg a + ----------- =
1+cos a
cos a sin a cos a*(1+cos a)+sin^ a
= --------- + ------------ = ------------------------------ =
sin a 1+cos a sin a *(1+cos a)
cos a + cos^2 a + sin^2 a 1+cos a 1
= ---------------------------------- = ------------------- = --------
sin a*(1+cos a) sin*(1+cos a ) sin a
1
P = --------
L = P
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sin a 1
ctg a + ---------- = -------
1+cos a sin a
sin a
L = ctg a + ----------- =
1+cos a
cos a sin a cos a*(1+cos a)+sin^ a
= --------- + ------------ = ------------------------------ =
sin a 1+cos a sin a *(1+cos a)
cos a + cos^2 a + sin^2 a 1+cos a 1
= ---------------------------------- = ------------------- = --------
sin a*(1+cos a) sin*(1+cos a ) sin a
1
P = --------
sin a
L = P