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In Delta ABC, cos""((B+2C+3A)/(2))+ cos"...

In `Delta ABC, cos""((B+2C+3A)/(2))+ cos""((A-B)/(2))=`

A

`-1`

B

`0`

C

1

D

2

Text Solution

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The correct Answer is:
B
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 A ( TRIGONOMETRIC FUNCTIONS)
  1. If "cosec"(pi//2+ theta )+x cos theta cot(pi//2-theta )=sin(pi//2+ the...

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  2. In Delta ABC, cos""((3A+2B+C)/(2))+ cos""((A-C)/(2))=

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  3. In Delta ABC, cos""((B+2C+3A)/(2))+ cos""((A-B)/(2))=

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  4. In DeltaABC , tan""((A+B)/(2))*tan""(C)/(2)=

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  5. If A,B,C,D are the angles of a cyclic quadrilateral then sinA+sinB=

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  6. If A,B,C,D are the angles of a cyclic quadrilateral then cos A + cos...

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  7. If A,B,C,D are the angles of a quadrilateral then tan""((A+B)/(4))=

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  8. If A,B,C,D are the angles of a quadrilateral then cos""((A+B)/(2))+ ...

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  9. ( sin (-660^(@)) tan (1050^(@)) sec (-420^(@)))/(cos(225^(@)) "cosec"(...

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  10. (cos(180^(@)-A)*cot(90^@+A)*cos(-A))/(tan(180^(@)+A) tan(270^(@) +A)* ...

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  11. ( sin (15pi//9)*tan(4pi//3)*sec(-7pi//3))/(cot(-3pi//4)*cos(7pi//6)*"c...

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  12. (tan(35pi//6)*sin(-11pi//3)*sec(-7pi//3))/(cot(5pi//4)*"cosec"(7pi//4)...

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  13. sin""((pi)/2+ theta ) * cos (pi- theta ) * cot ""((3pi)/(2)+ theta ) -...

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  14. If tan 20^(@) = lambda , " then " (tan 250^@ + tan 340^(@))/(tan 200^...

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  15. If tan20^(@) = lambda then show that (tan 160^(@) -tan 110^(@))/(1+tan...

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  16. If alpha , beta are complementary angles , then sin^(2) alpha + sin...

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  17. If alpha , beta are supplementary angles , then cos^(2)alpha + sin^(...

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  18. If x= sin 1 , y=sin1^(@) then

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  19. If x=cos 1 , y= cos1^(@) then

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  20. If x=tan1 , y=tan1^(@) then

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