Find \(\cos { \left( \frac { \pi }{ 2 } +\theta \right) +\cos { \left( \frac { 3\pi }{ 2 } +\theta \right) +\cos { \left( \frac { 5\pi }{ 2 } +\theta \right) \\ +\cos { \left( \frac { 7\pi }{ 2 } +\theta \right) +\ldots\quad upto\quad 2021\quad terms } } } \quad \quad }\)

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