cos 5^(@).cos 10^(@).cos 15^(@)....cos 1...

`cos 5^(@).cos 10^(@).cos 15^(@)....cos 100^(@)` के बराबर है-

A

1

B

0

C

`-1`

D

`(1)/(2)`

Verified by Experts

The correct Answer is:

B

cos 5^(@).cos 10^(@).cos 15^(@)....cos 100^(@) के बराबर है-
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cos ^ (2) (5 ^ (0)) + cos ^ (2) (10 ^ (0)) + cos ^ (2) (15 ^ (0)) + .....
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cos((pi)/(15))cos((2 pi)/(15))cos((pi)/(5))cos((4 pi)/(15))cos((2 pi)/...
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cos^(2)5^(@) +cos^(2)10^(@) + cos^(2) 15^(@) +…..+cos^(2) 85^(@) + cos...
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(cos 6x + 6 cos 4x + 15 cos 2x + 10)/(cos 5x + 5 cos 3x + 10 cos x ) i...
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The expression (cos 6x+6cos 4x+15 cos 2x+10)/(cos 5x+5 cos 3x+10 co...
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( cos 6 x + 6 cos 4 x+ 15 cos 2 x+ 10)/( cos 5 x+ 5 cos 3 x + 10 cos ...
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cos^(2)5^(@)+cos^(2)10^(@)+cos^(2)15^(@)+..+cos^(2)355^(@)
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व्यंजक (cos 6x + 6 cos 4 x + 15 cos 2x + 10)/(cos 5x + 5 cos 3x + 10 c...
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