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Verified answer
-1.013407049 dah itu aja jawaban nya=>sin (45°+15°) + sin (45°-15°)
=>sin 60° + sin 30°
=>[ √3 + 1 ] / 2
2.)2 cos 45° sin 15°
=>sin (45°+15°) - sin (45°-15°)
=> sin 60° - sin 30°
=>[ √3 + 1] / 2
3.)2 sin 70° cos 20°
=> sin (70°+20°) + sin(70°-20°)
=>sin 90° + sin 50°
=>1 + sin 50°
4.)2 sin 225° cos 195°
=>sin(225°+195°) + sin(225°-195°)
=>sin 420° + sin 30°
=>[ √3 + 1] / 2