cos^2 (x) = cos²(x) = cos(x) . cos(x) = ( cos(x) )²
cos(2x) = cos(x+x) = cos²(x) - sin²(x)
dengan identitas pitagoras, cos(2x) punya 2 rumus lagi :
cos(2x) = 2.cos²(x) - 1 = 1 - 2.sin²(x)
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
kalau cos^2x berarti cosnya yang dikuadratkan
Misal cos^2 60 derajat
Cos 60 = 1/2
Berarti cos^2 60 = (1/2)^2 = 1/4
Kalau misalnya cos2x berarti x nya yang dikali 2
misal cos2(60) derajat
Berarti
cos 2(60) = cos 120 = -1/2
cos^2 (x) = cos²(x) = cos(x) . cos(x) = ( cos(x) )²
cos(2x) = cos(x+x) = cos²(x) - sin²(x)
dengan identitas pitagoras, cos(2x) punya 2 rumus lagi :
cos(2x) = 2.cos²(x) - 1 = 1 - 2.sin²(x)