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If A+B+C =pi, and cos A = cos B. cos C, ...

If `A+B+C =pi, and cos A = cos B. cos C,` then `cot B. cot C =`

A

2

B

3

C

`1//2`

D

5

Text Solution

Verified by Experts

The correct Answer is:
C
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OBJECTIVE RD SHARMA-PROPERTIES OF TRIANGLES AND CIRCLES CONNECTED WITH THEM-Chapter Test
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  2. In a triangle ABC, cos A+cos B+cos C=

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  3. If A+B+C =pi, and cos A = cos B. cos C, then cot B. cot C =

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  10. If the angles of a triangle are in the ratio 7:2:1, then prove that th...

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  11. If in DeltaABC, a = 5, b = 4 and cos (A - B) = 31/32, then

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  12. In a triangleABC"if c"=(a+b) sin theta and cos theta=(ksqrtab)/(a+b),"...

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  13. In triangleABC," if"(s-a)/(Delta)=1/8, (s-b)/(Delta)=1/12 and (s-c)/(D...

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  15. If in a triangle A B C ,acos^2(C/2)ccos^2(A/2)=(3b)/2, then the sides ...

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  16. The sides of a right angled triangle arein A.P, then they are in the ...

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  17. ln a triangle ABC, B=90^@ then the value of tan(A/2)=

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  18. ln a triangle ABC, B=90^@ then the value of tan(A/2)=

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  19. In a triangleABC" if "a=5, b=4 and tan""C/2=sqrt7/3"then c=

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  20. In a triangleABC, if angle C=60^(@) then (a)/(b+c)+(b)/(c+a)=

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