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tanA +tanB + tanC = tanA tanB tanC if...

`tanA +tanB + tanC = tanA tanB tanC` if

A

A,B,C must be angles of a triangle

B

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

C

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

D

`A+B+C` must be odd integral multiple of `pi`.

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The correct Answer is:
C
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AAKASH INSTITUTE-TRIGNOMETRIC FUNCTIONS -Section-B (Objective Type Questions One option is correct)
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  11. If A, B, C are in A.P., then correct relation is cotA=(sinB+sinC)/(co...

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  12. cos(pi/14)+cos((3pi)/14)+cos((5pi)/14)=kcot(pi/14) then k is equal t...

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  14. If 4nalpha =pi then cot alpha cot 2 alpha cot 3alpha ...cot (2n-1)alph...

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  18. If tan^2alpha-2tan^2beta=1 then which of the following options is corr...

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