Matematika Trigonometri1. Sin 155°= 2. Tan 275°= 3. Cos (-125°)= 4. Sin 890°= 5. Tan 1420°= 6. Tan 225° + Sin 300°= 7. Cos 495°- Sin 210°=​​

Danika Nitzsche – March 08, 2023

Trigonometri

1. Sin 155°=
2. Tan 275°=
3. Cos (-125°)=
4. Sin 890°=
5. Tan 1420°=
6. Tan 225° + Sin 300°=
7. Cos 495°- Sin 210°=​​

Penjelasan dengan langkah-langkah:

1. Sin 155°

= Sin (180 – 25)°

= Sin 25°

2. Tan 275°

= Tan (270 + 5)°

= –Tan 5°

3. Cos (-125°)

= Cos –(180 – 55)°

= Cos 55°

4. Sin 890°

= Sin (1.080 - 190)°

= Sin 190°

= Sin (180 + 10)°

= Sin 10°

5. Tan 1420°

= Tan (1440 - 20)°

= – Tan 20°

6. Tan 225° + Sin 300°

= Tan (180+45)° + sin (360-60)°

= Tan 45° – sin 60°

= 1 – ½√3

= ½√3

7. Cos 495°- Sin 210°

= Cos (360 + 135)° – sin (180 + 30)°

= Cos (180 – 45)° + sin 30°

= – cos 45° + ½

= –½√2 + ½

= ½(1 – √2)

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