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Tg 2t. Cos. 1+Ctg2a 1/sin2a. Sin a \ 2sin a/2 * cos a/2/sin^2a/2 + cos^2 a/2 = 2tg a/2/1+TG^2 A/2.
Cos. 1+Ctg2a 1/sin2a. Sin a \ 2sin a/2 * cos a/2/sin^2a/2 + cos^2 a/2 = 2tg a/2/1+TG^2 A/2.

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