JEE Math Practice Question
If $$x = \sqrt {{2^{\cos e{c^{ - 1}}}}} $$ and $$y = \sqrt {{2^{se{c^{ - 1}}t}}} \,\,\left( {\left| t \right| \ge 1} \right),$$ then $${{dy} \over {dx}}$$ is equal to :
- A.$${y \over x}$$
- B.$${x \over y}$$
- C.$$-$$ $${y \over x}$$
- D.$$-$$ $${x \over y}$$
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