Tolong jawaban + cara nomor 15

Lim 1-√x / 1-x²
x→1
Turunkan
maka
Lim -½x^-½ / -2x
x→1
-1 / 2√1 / -2(1)
-½ / -2
-½ x (-½)
¼

Lim (1 - √x)/(1 - x^2) . (1 + √x)/(1 + √x)
= Lim (1 - x) / (1 + x)(1 - x)(1 + √x)
= Lim 1/(1 + x)(1 + √x)
= 1/(1 + 1)(1 + √1)
= 1/(2)(2)
= 1/4