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If P=cospi/(20)dotcos(3pi)/(20)dotcos(7p...

If `P=cospi/(20)dotcos(3pi)/(20)dotcos(7pi)/(20)dotcos(9pi)/(20)&Q=cospi/(11)dotcos(2pi)/(11)dotcos(8pi)/(11)dotcos(16pi)/(11),` then `P/Q` is not defined (b) 1 (c) 2 (d) None of these

A

not defined

B

1

C

2

D

None of these

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The correct Answer is:
A
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If P=cos(pi)/(20)*cos(3 pi)/(20)*cos(7 pi)/(20)*cos(9 pi)/(20)&Q=cos(pi)/(11)*cos(2 pi)/(11)*cos(8 pi)/(11)*cos(16 pi)/(11) , then (P)/(Q) is not defined (b) 1 (c) 2 (d) None of these

cos(pi)/(11)+cos(3 pi)/(11)+cos(5 pi)/(11)+cos(7 pi)/(11)+cos(9 pi)/(11)=(1)/(2)

cos(pi)/(11)+cos(3 pi)/(11)+......cos(9 pi)/(11)=(1)/(2)

cot(pi/20).cot((3pi)/20)cot((5pi)/20)cot((7pi)/20)cot((9pi)/20)=....

The value of cos""(pi)/(11)+cos""(3pi)/(11)+cos""(5pi)/(11)+cos""(7pi)/(11)+cos""(9pi)/(11), is

The value of (cos pi)/(11)+(cos(3 pi))/(11)+(cos(5 pi))/(11)+(cos(7 pi))/(11)+(cos(9 pi))/(11)

cot((pi)/(20))cot((3 pi)/(20))cot((5 pi)/(20))cot((7 pi)/(20))cot((9 pi)/(20))cot((15 pi)/(20))=

cos ((pi) / (11)) cos ((2 pi) / (11)) cos ((3 pi) / (11)) ... cos ((11 pi) / (11)) =

cos ((pi) / (11)) cos (2 (pi) / (11)) cos (3 (pi) / (11)) cos (4 (pi) / (11)) cos (5 (pi) / (11))

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