Pertanyaan

Nilai dari cos 12 5 o − cos 3 5 o sin 12 5 o + sin 3 5 o = ...

Nilai dari $\frac{sin 12 5 ^{o} + sin 3 5 ^{o}}{cos 12 5 ^{o} - cos 3 5 ^{o}} = ...$

Y. Endah

Master Teacher

Mahasiswa/Alumni Institut Teknologi Bandung

Jawaban terverifikasi

Pembahasan

$fraction numerator sin space 125 to the power of o plus sin space 35 to the power of o over denominator c o s space 125 to the power of o minus c o s space 35 to the power of o end fraction equals fraction numerator 2 space sin space 80 to the power of o. cos space 45 to the power of o over denominator negative 2 space s i n space 80 to the power of o. s i n space 45 to the power of o end fraction equals fraction numerator negative cos space 45 to the power of o over denominator s i n space 45 to the power of o end fraction equals negative fraction numerator begin display style 1 half end style square root of 2 over denominator 1 half square root of 2 end fraction equals negative 1$