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Let A and B denote the statements A:co...

Let A and B denote the statements
`A:cos alpha+ cos beta+cos gamma=0`
`B:sin alpha+sin beta+singamma=0`
If `cos(beta-gamma)+cos(gamma-alpha)+cos(alpha-beta)=-(3)/(2)`, then

A

A is true and B is false

B

A is false and B is true

C

both A and B are true

D

both A and B are false

Text Solution

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The correct Answer is:
C
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OBJECTIVE RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS AND IDENTITIES-Exercise
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  10. If piltthetalt 2pi, then sqrt((1+costheta)/(1-costheta)) is equal to

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  11. If theta lies in the second quadrant. Then the value of sqrt((1-sin ...

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  14. If 0^@ltthetalt180^@ then sqrt(2+sqrt(2+sqrt(2+...+sqrt(2(1+costheta))...

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