Question

#TRIGONOMETRY-TIME


The value of cosπ/19 + cos3π/19 + cos5π/19 +.......+ cos17π/19 is equal to:

[A] 1/2 .

[B] 0 .

[C] 1 .

[D] 2 .​

Answer 1

Answer:

→ Option (A) .

Step-by-step explanation:

For solution :

See the attachment.

Hence, it is solved.