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```        4.     The value of 16 cos(2π/15)  cos(4π/15) cos(8π/15) cos(16π/15) is
(a)    1
(b)    3
(c)    -1
(d)    None of these
7 years ago

80 Points
```										i thnk the answer is -1......

get a tricks
the no of cos function is 4.........  ans 1/2^4....................  if we multiply 8*2 then its values is 16 which exceeds 15...........  so sign is negative....................  if you like my answer please please approve it...........  its a very good tricks..........

the mod of the value is 1.........  but i dont emember its -1 or +1.........  if it is -1 then its the tricks.............  if it is +! then sign system is applicable for  only sin function............

thanks............  approve it..............
```
7 years ago
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