Teaching DSSSB TGT Mock Test 2025 Mathematics Relations and Functions

मान लीजिए f ∶  R → R को f(x) = x2 + 1 द्वारा परिभाषित किया जाता है। तब, 17 और -3 के पूर्व-प्रतिबिम्ब क्रमशः निम्न हैं

1
ϕ, {4, – 4}
2
{3, – 3}, ϕ
3
{4, –4}, ϕ
4
{4, – 4, {2, – 2}
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