Hitunglah sin 5π/8 ; cos 5π/8 ; tan 5π/8
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sin 5phi/8 = sin 5×180/8
= sin 112,5°
= 0,92
cos 5phi/8 = cos 112,5°
= -0,38
tan 5phi/8 = tan 112,5°
= -2,41