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<br/> mungkin soalnya yang 2x itu 2x²sehingga jawabnya 1
Ingat bahwa
1 = sin^2 x
cos 2x = cos^2 x - sin^2 x
lim(sin^2x+cos^2x-(cos^2x-sin^2x)/ 2x
x->0
lim (2sin^2 x ) / 2x
x->0
= lim sin^2 x / x
x->0
lim sin x
x->0
= 0