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tan 40^circ + 2tan 10^circ is equal to...

`tan 40^circ + 2tan 10^circ` is equal to

A

`tan 60^circ`

B

`tan 50^circ`

C

`tan 40^circ`

D

none of these

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A DAS GUPTA-Circular Functions, Identities -Exercise
  1. If alpha = theta1 +theta2 and x = theta1 -theta2 and tan theta1 = lamb...

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  2. If ABCD is a cyclic quadrilateral then cos A + cos B + cos C + cos D ...

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  3. tan 40^circ + 2tan 10^circ is equal to

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  4. If cos(alpha + gamma)/cos(alpha - gamma) = cos 2beta then tan alpha, t...

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  5. The value of sqrt3 cosec 20^circ - sec 20^circ is equal to

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  6. The number of real values of x for which sin(e^x) = 5^(x)+5^(-x) is

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  7. If cot y= (sin x- sin z)/(cos z- cos x) then which of the following ...

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  8. The value of cos^(2)x + cos^(2) (pi/3 + x) - cos x *cos(pi/3+ x) is

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  9. The equation (cos p-1) x^(2) + cos p*x + sin p = 0 where x is a varia...

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  10. If tan ((pi)/(4) + theta) + tan ((pi )/(4) - theta) = p sec 2 theta) t...

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  11. The value of sin sqrt(x^(2) - pi^(2)/36) lies in the interval

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  12. If alpha, beta are two values lying between 0 and 2pi for which tan t...

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  13. sin theta = x + 1/x is possible for some real values of x.

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  14. Is (sec x + tan x + 1)(sec x - tan x - 1) - 2tan x = 0 an identity.

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  15. The maximum value of 5cos theta + 12 sin theta is 17. This statement ...

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  16. If x = rsin theta*cos phi, y = rsin theta*sin phi and z = rcos theta ...

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  17. The minimum value of 3 cos x+4 sin x+8 is:

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  18. tan 22 1^circ/2 is a root of the equation - (1+x^(2))/(1- x^(2)) = sq...

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  19. If tan theta= 2 is satisfied by alpha, beta then the value of frac{tan...

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  20. sin 1^circ lt sin 1. Given statement is true or false.

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