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Kelas : 10 SMA
Pembahasan : sin 140° = √1-a²
Perhitungan terlampir
a=tinggi,1=s. miring
alas=√1^2-a^2
=√1-a^2
cos 50°=√1-a^2
sin 140°=sin(90°+50°)..... ingat sin(90°+α)=cos α
=cos 50°
=√1-a^2
jadikan jawaban terbaik jika membantu
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