NDA Math Trigonometric Ratios of Angles and Equations

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Question : 55 of 100

Marks: +1, -0

What is the value of

(1+cos‌‌

π

8

)(1+cos‌‌

3π

8

)(1+cos‌‌

5π

8

)(1+cos‌‌

7π

8

)

?

[NDA II 2016]

1
2
1
2
+
1
2√2
‌‌
1
2
−‌‌
1
2√2
1
8

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