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Statement-1: cos10^(@)+cos20^(@)+…..+cos...

Statement-1: `cos10^(@)+cos20^(@)+…..+cos170^(@)=0`
Statement-2: `cos alpha+cos(alpha+beta)+....+cos(alpha+(n-1)beta)=(cos(alpha+((n-1)beta)/(2))sin((nbeta)/(2)))/(sin((beta)/(2))), beta ne 2npi.`

A

statement 1 is true , statement 2 is false.

B

statement 1 is false, statement 2 is true.

C

statement 1 is true , statement 2 is true and statement 2 is correct explaination of statement 1.

D

statement 1 is true , statement 2 is true but statement 2 is not correct explaination of statement 1.

Text Solution

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The correct Answer is:
A
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