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Nilai dari cos (5π/6) adalah ….

Nilai dari cos (5π/6) adalah ….
a. 1/2 √3
b. 1/3 √3
c. 1/2
d. -1/2
e. -1/2 √3

Jawaban yang benar adalah E. -½√3.

Sifat :
π = 180°
cos (180° – a) = – cos a
cos 30° = ½√3

cos (5π/6) = cos (5 · 180°/6)
= cos 150°
= cos (180° – 30°)
= – cos 30°
= – ½√3

Maka, cos (5π/6) = -½√3.

Jadi, pilihan yang tepat adalah E.

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