Jawab:
B
Penjelasan dengan langkah-langkah:
cos² A - sin² A
= 1 - 2 sin² A
= 1 - 2 ([tex]\frac{-\sqrt{3}}{2}[/tex]) ²
= 1 - 2(3/4)
= 1 - 6/4
= - 2/4
= - 1/2
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Jawab:
B
Penjelasan dengan langkah-langkah:
cos² A - sin² A
= 1 - 2 sin² A
= 1 - 2 ([tex]\frac{-\sqrt{3}}{2}[/tex]) ²
= 1 - 2(3/4)
= 1 - 6/4
= - 2/4
= - 1/2