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S²+C²=1
(S+C-1)(S-C+1)
=(S²-1)-C²+2C
=-C²-C²+2C
=2C(1-C)
(S+C-1)(S-C+1)/2SC
=2C(1-C)/2SC
=(1-C)/S
=(1-cosx)/sinx
=2sin(x/2)²/2sin(x/2)cos(x/2)
=tan(x/2)
(S+C-1)(S-C+1)
=(S²-1)-C²+2C
=-C²-C²+2C
=2C(1-C)
(S+C-1)(S-C+1)/2SC
=2C(1-C)/2SC
=(1-C)/S
=(1-cosx)/sinx
=2sin(x/2)²/2sin(x/2)cos(x/2)
=tan(x/2)
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