sin 30°. cos 30° + sin 60. cos 60° =n. nilai n^2 +1 adlh TLG PK CRNY YA YG JLS

sin 30° . cos 30° + sin 60° . cos 60° = n

nilai n^2 + 1 = .....??

n = 1/2.1/2√3 + 1/2√3.1/2
n = 1/4√3 + 1/4√3
n = 2/4√3
n = 1/2√3

jadi n^2 + 1 = (1/2√3)^2 = 1/4.3 = 3/4