1) y = (5 - x)Cosx
y ' = (5 - x)' * Cosx + (5 - x) * (Cosx)' = - 1 * Cosx + (5 - x) *(- Sinx) =
= - Cosx - (5 - x)Sinx
y '(π) = - Cosπ - (5 - π) * Sinπ = - (- 1)- (5 - π) * 0 = 1
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1) y = (5 - x)Cosx
y ' = (5 - x)' * Cosx + (5 - x) * (Cosx)' = - 1 * Cosx + (5 - x) *(- Sinx) =
= - Cosx - (5 - x)Sinx
y '(π) = - Cosπ - (5 - π) * Sinπ = - (- 1)- (5 - π) * 0 = 1