bantuin dong kakak please dari a smpai f
Matematika
zennisilitonga
Pertanyaan
bantuin dong kakak please dari a smpai f
1 Jawaban
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1. Jawaban whongaliem
a) sin 353° = sin (360 - 7)°
= - sin 7°
b) cos 115° = cos (90 + 25)°
= - sin 25°
c) sin² 780° = sin² (60° + 2. 360°)
= sin² 60°
= (1/2 √3)²
= 3/4
d) cos² 510 = cos² (150° + 1 . 360°)
= cos² 150°
= cos² (90° + 60°)
= (- sin)² 60°
= sin² 60°
= (1/2 √3)²
= 3/4
e) sin β = 2/3
cot² β + 1 = 1/sin² x
cot² β + 1 = 1 /(2/3)²
cot² β + 1 = 1 / (4/9)
cot² β + 1 = 9/4
cot² x = 9/4 - 1
cot² x = 5/4
cot x = √(5/4)
cot x = (1/2)√5
f ) gk faham maksudnya ...