Упростить:
cos([tex] \alpha [/tex]-[tex] \beta [/tex] - cos([tex] \alpha [/tex]+[tex] \beta [/tex])
cos (3[tex] \pi [/tex]/2 - [tex] \alpha [/tex]) + cos ([tex] \pi [/tex]+[tex] \alpha [/tex])
2sin([tex] \alpha [/tex]-[tex] \pi[/tex]/2)*cos(-[tex] \alpha [/tex]) + 1

Буду очень благодарна за решение.
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