Question

perhatikan gambar dibawah ini !​

Answer 1

Pendahuluan

• Cos 2α = cos²α - sin²α
• = 2cos² α - 1
• = 1 - 2 sin² α

[tex] \\ [/tex]

[tex] \cos2 \alpha = 1 - 2( \frac{1}{5} \sqrt{13} ) {}^{2} [/tex]

[tex] \ = 1 - 2( \frac{1}{25} \times 13)[/tex]

[tex] \ = 1 - 2( \frac{13}{25} )[/tex]

[tex] \ = 1 - \frac{26}{25} [/tex]

[tex] \ = \frac{25}{25} - \frac{26}{25} [/tex]

[tex] \bf = \boxed{ \bf- \frac{1}{25} }[/tex]

[tex] \\ [/tex]

Pelajari lebih lanjut

• brainly.co.id/tugas/2867308
• brainly.co.id/tugas/2285573
• brainly.co.id/tugas/14431676

[tex] \\ [/tex]

Detail jawaban

Kelas : 10

Mapel : Matematika

Bab : Bab 7 - Trigonometri

Kode : 10.2.7

Salah langsung report saja ya TvT

[tex]\tiny{ \orange{\tt ༆ \: Uzeyji}}[/tex]