sin^4a+2sin^2a*cos^2a+cos^4a-1=упростить

Question

sin^4a+2sin^2a*cos^2a+cos^4a-1=упростить

Answer 1

sin^4a+2sin^2a*cos^2a+cos^4a-1= (sin^2a+cos^2a)^2 - 1 = 1^2 - 1 = 0

Answer 2

sin^4a+2sin^2a*cos^2a+cos^4a-1= (sin^2a+cos^2a)^2 - 1 = 1^2 - 1 = 0