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If a= b cos ""(2pi)/(3) = c cos ""(4pi)/...

If `a= b cos ""(2pi)/(3) = c cos ""(4pi)/(3),` then the value of `(ab+ bc +ca)` is-

A

1

B

2

C

0

D

`-1`

Text Solution

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The correct Answer is:
C
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CHHAYA PUBLICATION-MCQ's-QUESTION PAPER 6
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  4. The sides of a tringle are 3x+4y, 3y and 5x+5y where x,y gt0, then the...

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  5. The value of 16 sin 144^(@) sin 108^(@) sin 72^(@)sin 36^(@) is-

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  6. If sin x + sin ^(2) x=1 then the value of (cos ^(8) x+2 cos ^(6)x +co...

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  7. If A+B +C =pi, 0 lt A, B lt pi/2 and the angle C is obtuse then-

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  8. If sin alpha = sin beta and cos alpha = cos beta then-

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  9. The value of cot 36^(@)cot 72^(@) is-

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  10. In a triangle ABC, if (cos A)/(a) =(cos B)/(b ) =(cos C)/(c) and the ...

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  11. If sin alpha + sin beta + sin gamma =3, then the value of (cos alpha +...

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  12. The value of (1+ cos ""(pi)/(8))(1+cos""(3pi)/(8))(1+ cos ""(5pi)/(8))...

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  14. The maximum value of 5 cos theta + 3 cos ((pi)/(3)+ theta ) + 3 is-

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  15. If m= sin ^(2) theta + cos ^(4)theta, then-

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  16. If A+C+B=180, then the value of (cos ^(2) A+ cos ^(2) B +cos ^(2) C-2 ...

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  17. In any triangle ABC, the value of (b+c) tan ""A/2 tan ""(B-C)/(2)+ (c+...

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  18. When n is an odd integer, then the total number of terms in the expres...

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  19. The value of (cosec 2A - cot 2A) is-

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  20. The general solution of sin x- cos x=sqrt2 is-

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