Question

Minta jawabanya dong ??
1). cos 195 + cos 105
2). sin 105 - sin 15
3). sin 75 + sin 15

di sederhanakanlah,!!

Answer 1

Verified answer

1.)cos 195° + cos 105°
=> 2 cos 150° cos 45°
=> 2 • (-√3/2 ) • (√2/2)
=>-√6/2

2.)sin 105° - sin 15°
=>2 cos 60° sin 45°
=>2 • (½) • (√2/2)
=>√2/2

3.)sin 75°+sin 15°
=>2 sin 45° cos 30°
=> 2 • (√2/2) •(½)
=>√2/2