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In a triangle ABC, (cosB+cosC)/(1-cosA)=...

In a triangle ABC, `(cosB+cosC)/(1-cosA)`=

A

`(b+c)/(1-a)`

B

`(bc)/(1-a)`

C

`(b+c)/a`

D

`a/(b+c)`

Text Solution

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The correct Answer is:
C
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DIPTI PUBLICATION ( AP EAMET)-PROPERTIES OF TRIANGLES -EXERCISE 1A
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  2. In Delta ABC,a(b cos C-c cos B)=

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  3. In a triangle ABC, (cosB+cosC)/(1-cosA)=

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  4. In Delta ABC, b cos (C+ theta)+c cos (B- theta)=

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  5. In DeltaABC,(b-c)/(b+c)cot""A/2+(b+c)/(b-c) tan""A/2=

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  6. In a DeltaABC,sum(b+c)tan""A/2tan((B-C)/2)=

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  7. In a DeltaABC,(a+b+c)(tan""A/2+tan""B/2)=

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  8. In Delta ABC, (a+b+c)(tan""A/2+tan""B/2)tan""C/2=

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  9. In Delta ABC, (a-b)^2cos^2""C/2+(a+b)^2sin^2""C/2=

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  10. Two sides of a triangle are given by the roots of the equation x^2-5x+...

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  11. In DeltaABC,(bc cosA+ca cos B+ab cosC)/(cotA+cot B+cotC)=

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  12. In DeltaABC,(cot(A//2)+cot(B//2)+cot(C//2))/(cotA+cotB+cotC)=

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  13. In Delta ABC, sum (a+b) tan ((A-B)/2)=

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  14. In Delta ABC,a^2 sin 2C+c^2 sin 2A=

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  15. In Delta ABC, R^2 (sin 2A+ sin 2B+ sin 2C)=

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  16. In Delta ABC, if A,B,C are in A.P then (a+c)/sqrt(a^2-ac+c^2)=

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  17. In Delta ABC, if a,b,c are in A.P the greatest angle is A and least is...

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  18. In Delta ABC, if x=tan((B-c)/2)tan""A/2,y=tan((C-A)/2)tan""B/2,z=tan(...

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  19. In Delta ABC, if cos A+2 cos B+cos C=2, then the sides of the triangle...

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  20. In Delta ABC, if a sin^2""C/2+c sin^2""A/2 in terms of s,a,b,c is

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