I would come back to my apartment in New York.
(Choose the correct option using ‘used to’ for the given sentence and rewrite.)
The phrase "used to" is applied when describing past habits or actions that no longer happen.
Rewritten Sentence: I used to come back to my apartment in New York.
Explain the construction of a spherical wavefront by using Huygens' principle.
The slope of the tangent to the curve \( x = \sin\theta \) and \( y = \cos 2\theta \) at \( \theta = \frac{\pi}{6} \) is ___________.