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Cos 143
= Cos (180 - 37)
= - Cos 37
= - 0,8
Sin 143
= Sin (180 - 37)
= Sin 37
= 0,6
2)
Cos 225
= Cos (180 + 45)
= - Cos 45
= - 1/2 √2
Sin 225
= Sin (180 + 45)
= -Sin 45
= - 1/2 √2
3)
Cos 270
= Cos (360 - 90)
= Cos 90
= 0
Sin 270
= Sin (360 - 90)
= - Sin 90
= -1