Известно, что [tex]ctg(t- \pi )=- \frac{3}{4} [/tex] и [tex] \frac{ \pi }{2} < t< \pi .[/tex]
Найдите: а)[tex] cos( \frac{3 \pi }{2} - t)[/tex];
               б)[tex] cos ( \pi +t)[/tex];
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