Nilai cos 2025° =
a. -1/2
b. 1/2√3
c. -1/2 √3
d. -1/2 √2
e. 1/2 √2
a. -1/2
b. 1/2√3
c. -1/2 √3
d. -1/2 √2
e. 1/2 √2
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Penjelasan dengan langkah-langkah:
cos 2.025°
= cos(5×360° + 225°)
= cos 225°
= cos(180 + 45)°
= -cos 45°
= -1/2 √2
Opsi D