August 2022 0 9 Report
Помогите, пожалуйста!
Упростите выражение:
a) Соs(x+y) + Cos([tex] \frac{3 \pi }{2} +x)[/tex] Cos([tex] \frac{3 \pi }{2} +y)[/tex]
б) Cos(r-s) - Cos([tex] \frac{ \pi }{2} -r)[/tex] Cos([tex] \frac{ \pi }{2} -s)[/tex]
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