" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
sin³A+cos³A
---------------- =1-sinA cosA
sinA + cosA
pembuktian:
sin³A+cos³A (sinA+cosA) (sin²A-sinA cosA+cos²A)
---------------- = -------------------------------------------------
sinA+cosA sinA+cosA
= sin²A-sinA cosA+ cos²A
= sin²A+ cos²A- sinA cosA
=1 - sinA cosA
ps: a³+b³= (a+b) (a²-ab+b²)
identitas trigonometri: sin²A+cos²A= 1