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Choose the correct option In a triangl...

Choose the correct option
In a triangle ABC,`sin((A+B)/2)` is equal to
a)`cos(B-C)/2` b)`cos(C-A)/2` c)`cos(A/2)` d)`cos (C/2)`

A

`cos(B-C)/2`

B

`cos(C-A)/2`

C

`cosA/2`

D

`cos C/2`

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KALYANI PUBLICATION-RELATIONS BETWEEN TRIGONOMETRIC RATIOS AND RELATED IDENTITIES-EXERCISE
  1. Eliminate theta and phi sintheta +costheta =x, tantheta +cottheta=y

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  2. Eliminate theta x=a sintheta , y=a costheta

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  3. Eliminate theta and phi sintheta+costheta=a, sin^3theta+cos^3theta=b

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  4. Eliminate theta and phi sintheta+sinphi=a ,costheta+cosphi=b, theta-p...

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  5. If x=a sectheta *cosphiy=b sectheta*sinphi, z=c tantheta then prove...

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  6. Find the value of (sintheta)/(cosectheta)+(costheta)/(sectheta)-1

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  7. If theta is a positive acute angle and 2 costheta=1/2 sectheta,find th...

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  8. If theta be positive acute angle sin3 theta=cos(2theta+15),find the va...

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  9. If sec theta- tan theta=1/2,find the value of sec theta+ tan theta

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  10. If sin theta-cos theta=0,find the value of sec theta+ cosec theta

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  11. Fill in the gap 4sec^2(49)-4 tan^2(49)is equal to ........

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  12. Fill in the gap sin25-cos65is equal to ......

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  13. Fill in the gap If tan(x+28)=cot x,then value of x is.......

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  14. Fill in the gap If sin theta=x then sec theta in terms of x is.....

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  15. Fill in the gap If tanA=cotB,where A and B are two acute angles then ...

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  16. Choose the correct option cosec^2 A- cot^2B=1is possible if a)AgtB ...

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  17. Choose the correct option In a triangle ABC,sin((A+B)/2) is equal to...

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  18. Choose the correct option The value of sin theta cos (90- theta)+cos...

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  19. Choose the correct option If x=3 sec^2 theta,y=tan^2 theta-2,then x-...

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  20. If tantheta=p-1/(4p) , then sectheta-tantheta=

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