5.11. Докажите тождество:
a) sin t * ctg t = cos t; sin t
б)sin t:tg t = cos t;
в) ctg t * tg t = sin t;
г)cost:ctgt = sint.
a) sin t * ctg t = cos t; sin t
б)sin t:tg t = cos t;
в) ctg t * tg t = sin t;
г)cost:ctgt = sint.
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