Kak, tolong bantu jawab dong nomor 10-11

TRIGONOMETRI

10]

y = sin x + cos x

Maks/min → y' = 0

cos x – sin x = 0

cos x = sin x

sin x / cos x = 1

tan x = 1

x = 45° atau x = 225°

x = 45°

y = sin 45° + cos 45°

y = 2 × 1/2 √2

y = √2 → nilai maks

x = 225°

y = sin 225° + cos 225°

y = 2 × (-1/2 √2)

y = – √2 → nilai min