$\"\"$

The sequence $\"\"$ .

The first term of sequence $\"\"$ .

The second term of sequence $\"\"$ .

It is difficult to write the $\"\"$ term of the sequence in the exponential form.

As the even terms of the sequence are zeros and odd terms of the sequence are $\"\"$ s except the terms which are multiples of $\"\"$ .

Thus, the sequence looks like sine function of the angle $\"\"$ .

The $\"\"$ term of the sequence is $\"\"$ .

$\"\"$

The $\"\"$ term of the sequence is $\"\"$ .