Jawaban:
1. 3/5
2.
3. 0
Penjelasan dengan langkah-langkah:
1.
cos R= sa/mi
= QR/PR
= 3/5.
cos 225°
= cos(180+45°)
= -cos 45°
= -1/2 akar 2.
3.
sin 150° + cos 240°
= sin 30° - cos 60°
= 1/2 - 1/2
= 0
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Jawaban:
1. 3/5
2.
3. 0
Penjelasan dengan langkah-langkah:
1.
cos R= sa/mi
= QR/PR
= 3/5.
2.
cos 225°
= cos(180+45°)
= -cos 45°
= -1/2 akar 2.
3.
sin 150° + cos 240°
= sin 30° - cos 60°
= 1/2 - 1/2
= 0