7 points!
jika cos x = 2 sin x, maka nilai sin x * cos x adalah
a 1/5
b 1/4
c 1/3
d 2/5
e 2/3
jika cos x = 2 sin x, maka nilai sin x * cos x adalah
a 1/5
b 1/4
c 1/3
d 2/5
e 2/3
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Trigonometri
cos x = 2 sin x
sin x/cos x = depan/samping = 1/2
r = √(d² + s²) = √(1² + 2²) = √5
sin x × cos x
= d/r × s/r
= 1/√5 × 2/√5
= 2/5 ✔