Question
Find $\frac{d^2 y}{d x^2}$, if $y =2 at , x = at t ^2$.
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[p → (~ q ˅ r)] ↔ ~[p → (q → r)] is a tautology, contradiction or contingency.
| p | q | r | q → r | r → p | (q → r) ˅ (r → p) |
| T | T | T | T | $\square$ | T |
| T | T | F | F | $\square$ | $\square$ |
| T | F | T | T | $\square$ | T |
| T | F | F | T | $\square$ | $\square$ |
| F | T | T | $\square$ | F | T |
| F | T | F | $\square$ | T | $\square$ |
| F | F | T | $\square$ | F | T |
| F | F | F | $\square$ | T | $\square$ |