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B+C=180-A
sin½(B+C)=cos ½A
sin ½(180-A)= cos ½A
sin(90-½A)= cos A
cos ½A= cos½A
cos½(B+C)= sin ½A
cos½(180-A)= sin ½A
cos(90-½A)=sin½A
sin ½A= sin ½A
tan½(B+C)= cot½A
tan ½(180-A)= cot ½A
tan (90-½A)= cot ½A
cot½A= cot ½A
perbandingan trigonometri sudut berelasi