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In any Delta ABC,((a+b+c)(b+c-a)(c+a-b)(...

In any `Delta ABC,((a+b+c)(b+c-a)(c+a-b)(a+b-c))/(4b^2c^2)`=

A

` cos A cos B cos C `

B

` cos ^(2) A `

C

` sin ^(2) A `

D

` tan ^(2) A `

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-PROPERTIES OF TRIANGLES-EXERCISE - 1
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  7. In Delta ABC, if a,b,c are in A.P, then r1,r2,r3 are in

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  8. Prove that r+ r3 + r1 -r2= 4 R cos B

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  9. IF in a Delta ABC, r3=r1+r2+r, then angle A+ angle B=

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  14. The angle of elevation of the top of an unfinished tower from a point ...

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  16. A sphere of radius 'a' subtends an angle 60^(@) at a point P. Then the...

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  18. Two ships leave a port at the same time . One goes 24km per hour in th...

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