(SIN a + COS a) 2= 1+2 SIN a . COS a
Matematika
azisyahmuslimah
Pertanyaan
(SIN a + COS a) 2= 1+2 SIN a . COS a
1 Jawaban
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1. Jawaban DB45
identitas trigonometri
(sin a + cos a)² = 1 + 2 sin a cos a
ruas kiri
(sin a + cos a)² =
= (sin² a + 2 sin a cos a + cos² a)
= (sin² a + cos² a + 2 sin a cos a)
= ( 1 + 2 sin a cos a)