1) \\ cos( \pi - \alpha )ctg( \pi /2- \alpha )
2) \\ sin(270- \alpha )-sin(270+ \alpha )
3) \\ sin(2t-21 \pi )
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1) \\ cos( \pi - \alpha )ctg( \pi /2- \alpha )
2) \\ sin(270- \alpha )-sin(270+ \alpha )
3) \\ sin(2t-21 \pi )
4) \\ ctg( \pi /2- \alpha )sin( \beta - \pi /2)/cos( \pi - \beta )tg(- \alpha )

[/tex]