MCQ
જો $y = {t^{10}} + 1$ અને $x = {t^8} + 1,$ તો ${{{d^2}y} \over {d{x^2}}} = . . . . .$
- A${5 \over 2}t$
- B$20{t^8}$
- ✓${5 \over {16{t^6}}}$
- Dએકપણ નહીં
$\therefore $ ${t^8} = x - 1$ $ \Rightarrow \,\,\,{t^2} = {(x - 1)^{1/4}}$
So, $y = {(x - 1)^{5/4}} + 1$
Differentiate both sides w.r.t. $x,$ $\frac{{dy}}{{dx}} = \frac{5}{4}{(x - 1)^{1/4}}$
Again, differentiate both sides w.r.t. $x,$
$\frac{{{d^2}y}}{{d{x^2}}} = \frac{5}{{16}}{(x - 1)^{ - 3/4}}$
$\frac{{{d^2}y}}{{d{x^2}}} = \frac{5}{{16{{(x - 1)}^{3/4}}}} = \frac{5}{{16{{({t^2})}^3}}} = \frac{5}{{16\,{t^6}}}.$
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