#F
14) lim (x -> pi/4) {1 - sin 2x} / (cos² x)
15) lim(x->π/4) (1 - 2 sin² x) / (cos x - sin x)
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#F
14) lim (x -> pi/4) {1 - sin 2x} / (cos² x)
15) lim(x->π/4) (1 - 2 sin² x) / (cos x - sin x)