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If tan A+tan B+tan C=tan A . tan B . tan...

If `tan A+tan B+tan C=tan A . tan B . tan C` then

A

`A, B, C` must be angles of triangle

B

The sum of any two of `A, B, C` is equal to thi third

C

`A+B+C` must be an integral multiple of `pi`

D

none of these

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HIMALAYA PUBLICATION-MEASUREMENT OF ANGLES, TRIGONOMETRIC RATIOS AND RELATION BETWEEN SIDES AND ANGLES OF A TRIANGLE-QUESTION BANK
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  3. If tan A+tan B+tan C=tan A . tan B . tan C then

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  4. In a right angled triangle, the hypotenuse four times as long as the p...

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  5. If sin theta+cos theta=a then sin ^(4) theta+cos ^(4) theta=

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  6. If sin x+sin ^(2) x=1 then the value of cos ^(2) x+cos ^(4) x is

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  7. In a Delta ABC angle A is greater than B. If the measures of angles A ...

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  8. cos ^(2) (3 pi)/(5)+cos ^(2) (4 pi)/(5)=

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  9. cot theta=sin 2 theta,(theta ne n pi), if theta

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  10. If (pi)/(2) lt theta lt (3 pi)/(2) then sqrt((1-sin theta)/(1+sin thet...

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  11. If alpha in[-pi, pi] such that sqrt((1-sin alpha)/(1+sin alpha))=sec a...

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  12. If -(pi)/(4)lt A lt (pi)/(4), then (sqrt(1+sin 2 A)+sqrt(1-sin 2 A))/(...

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  13. If tan theta = -4/3, then sin theta is :

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  14. The greatest value of sin x cos x is

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  16. The value of cos (pi)/(5) . cos (2 pi)/(5). cos (4 pi)/(5) . cos (8 pi...

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  17. If sin theta+cosec theta=2, then sin ^(2) theta+cosec^(2) theta=

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  18. If f(x)=cos ^(2) x+sec ^(2) x, then

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  19. If tan theta=(1)/(2) and tan varphi=(1)/(3) then the value of theta+va...

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  20. Which of the following is not correct?

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