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If A+B+C=pi & cos A = cos B . Cos C then...

If `A+B+C=pi` & cos A = cos B . Cos C then tan B . Tan C has the value equal to

A

1

B

2

C

3

D

4

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The correct Answer is:
C
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MOTION-TRIGNOMETRIC RATIOS & IDENTITIES -Exercise 2(Level -I)
  1. the value of cos0+cos(pi/7)+cos(2pi/7)+cos(3pi/7)+cos(4pi/7)+cos(5pi/7...

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  2. If x sin 45^(@) cos^(2)60^(@)=(tan^(2)60^(@) cosec 30^(@))/(sec 45^(@)...

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  3. If A+B+C=pi & cos A = cos B . Cos C then tan B . Tan C has the value e...

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  4. If 3 sin alpha=5 sin beta, then (tan((alpha+beta)/(2)))/(tan ((alpha-b...

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  5. If f( theta ) = sin ^(3)theta + sin ^(3)( theta + (2pi)/(3)) + sin ^(3...

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  6. If cosec A + cot A =11/2 , then tan A equal to

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  7. Prove that : (tan^(2)theta)/(1+tan^(2)theta)+(cot^(2)theta)/(1+cot^...

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  8. If cos alpha+ cos beta =a sin alpha + sin beta =b alpha - beta = 2 the...

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  9. The value of (1-tan^2 1 5^(@))/(1+tan^2 1 5^(@)) is

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  10. IF tan^2 theta=2 tan^2 phi +1 then find the value of cos 2 theta+sin^2...

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  11. If alpha in [(pi)/(2),pi] then the value of sqrt(1+ sin alpha)-sqrt(...

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  12. sqrt(2+sqrt(2+2cos 4 theta)), forall 0 lt theta lt pi//4 is

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  13. The value of tan (pi/16)+2tan(pi/8)+4 is equal to

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  14. If A=tan6^(@) tan 42^(@) and B= cot 66^(@)cot 78^(@) then-

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  15. The value of 64sqrt(3)sin(pi/48)cos(pi/48)cos(pi/24)cos(pi/12)cos(pi/6...

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  16. Let a and b be positive number not equal to 1 and (3pi)/(2) lt theta ...

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  17. f(theta)=sin^4theta+cos^2theta then range of f(theta)

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  18. The value of cos(pi/19)+cos((3pi)/19)+cos((5pi)/19)+......+cos((17pi)/...

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  19. Value of cos(pi/(2n+1))+cos((3pi)/(2n+1))+cos((5pi)/(2n+1))+... upto ...

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  20. A regular hexagon & a regular dodecagon are inscribed in the same circ...

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