Tolong pakai caranya ya teman
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PR=akar(8^2+4^2)=akar(64+16)=akar(80)=akar(16x5)=4akar5
sin P=8/(4akar5)=8xakar5 / 4akar5 x akar5=8akar5 / 4x5=8akar5/20
cos P=4/4akar5=4akar5/20
tg P=8/4=2
sin R=4/4akar5=4akar5/20
cos R=8/(4akar5)=8xakar5 / 4akar5 x akar5=8akar5 / 4x5=8akar5/20
tg R=4/8=1/2