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The value of tan 1^(circ) . tan 2^(circ)...

The value of `tan 1^(circ) . tan 2^(circ) . tan 3^(circ) …..tan 89^(circ)` is

A

`(0)`

B

1

C

`(1)/(2)`

D

not defined

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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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  2. Which of the following is not correct?

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  3. The value of tan 1^(circ) . tan 2^(circ) . tan 3^(circ) …..tan 89^(cir...

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  4. The value of (1-tan ^(2) 15^(circ))/(1+tan ^(2) 15^(circ)) is

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  5. If tan thata = 3 and theta lies in third quadrant, then the value of s...

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  6. The value of tan 75^(circ)-cot 75^(circ) is equal to

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  7. Sin (45^(@)+theta)-cos(45^(@)-theta) is equal to :

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  8. cos 12^(circ)+cos 84^(circ)+cos 156^(circ)+cos 132^(circ)=

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  9. If tan A=(1)/(2), tan B=(1)/(3) then tan (2 A+B) is equal to

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  10. The value of sin (pi)/(10) sin (13 pi)/(10) is

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  11. The value of sin 50^(circ)-sin 70^(circ)+sin 10^(circ) is equal to

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  12. If sin theta+cos theta=1 then the value of sin 2 theta is equal to

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  13. If alpha+dot(beta)=(pi)/(4), then the value of (1+tan alpha)(1+tan bet...

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  14. If sin theta=-(4)/(5) and theta lies in 3 quadrant then the value of c...

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  15. The value of sin (pi/18)+sin ((pi)/(9))+sin 2(pi/9)+sin 5(pi/18) is gi...

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  16. If A lies in the second quadrant and 3 tan A+4=0 then the value of 2 c...

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  17. The value of cos ^(2) 48^(circ)-sin ^(2) 12^(circ) is

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  18. If tan alpha=(1)/(7), tan beta=(1)/(3), then cos 2 alpha is equal to

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  19. If tan theta=(a)/(b), then b cos 2 theta+a sin 2 theta is equal to

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  20. In a triangle A B C, hat(A)=30^(circ), b=8, a=6, then b=sin ^(-1) x, w...

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