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The value of the expression tan. (pi)/(7...

The value of the expression `tan. (pi)/(7)+ 2 tan. (2pi)/(7)+ 4 tan . (4pi)/(7)+ 8 cot. (8pi)/(7)` is equal to

A

`cosec. (2pi)/(7)+ cot. (2pi)/(7)`

B

` tan. (pi)/(14) - cot. (pi)/(14)`

C

`(sin. (2 pi)/(7))/(1-cos. (2pi)/(7))`

D

`(1+cos. (pi)/(7)+cos. (2pi)/(7))/(sin. (pi)/(7) + sin. (2pi)/(7))`

Text Solution

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The correct Answer is:
A, C, D
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ARIHANT MATHS-TRIGONOMETRIC FUNCTIONS AND IDENTITIES-Exercise (Questions Asked In Previous 13 Years Exam)
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  2. If alpha and beta are non-zero real number such that 2(cos beta-cos al...

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  3. Let -1/6 < theta < -pi/12 Suppose alpha1 and beta1, are the root...

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  4. The value of sum(k=1)^(13) (1)/(sin(pi/4 + ((k-1)pi)/(6))sin(pi/4 + (k...

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  6. The number of all possible values of theta, where 0 lt theta lt pi, f...

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  7. For 0 lt theta lt pi/2, the solution (s) of sum(m=1)^(6) cosec (the...

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  19. If 0 lt x lt pi and cos x + sin x = 1/2, then tan x is

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