परवलय y = x2 और y = -(x - 2)2 की उभयनिष्ठ स्पर्शरेखा का समीकरण है

1
y = 4x + 2
2
y = 4x + 4
3
y = -4(x - 1)
4
y = 4(x - 1)

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