Даю 30 балов!!! 22.4 упростите выражение:
1)
[tex] \frac{sin( \alpha ) \times \cos( \alpha ) }{ \tg( \alpha ) } - 1[/tex]
2)
[tex] \frac{ sin( \alpha ) \times \cos( \alpha ) }{ ctg( \alpha) } - 1[/tex]
3)
[tex] \frac{1}{1 - \cos( \alpha ) } - \frac{1}{1 + \cos( \alpha ) } [/tex]
4)
[tex] \frac{1 \ + tg( \alpha )}{1 + ctg( \alpha )} [/tex]
Плиз, решите правильно , умоляю
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