Fear at first sight, love at the second

Geometry Level 2

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

×

Problem Loading...

Note Loading...

Set Loading...