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The value of "tan"1^(@)."tan"2^(@)."tan"...

The value of `"tan"1^(@)."tan"2^(@)."tan"3^(@)......."tan"89^(@)` is

A

1

B

0

C

`oo`

D

`1//2`

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The correct Answer is:
A
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OBJECTIVE RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS AND IDENTITIES-Exercise
  1. The value of cos 10^(@) - sin10^(@) is

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  2. The value of cos1^0cos2^0cos3^0 cos 179^0 is 1//sqrt(2) b. 0 c. 1 d. -...

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  3. The value of "tan"1^(@)."tan"2^(@)."tan"3^(@)......."tan"89^(@) is

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  4. The maximum value of cos^2(pi/3-x)-cos^2(pi/3+x), is

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  5. Which of the following is correct sin 1^@ > sin 1

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  6. Given A=sin^2theta+cos^2theta, then for all real theta, 1lt=Alt=2 (b...

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  7. The expression tan^(2)alpha+cot^(2)alpha,is

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  8. If tantheta =-4/3," then " sintheta is

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  9. If costheta+sintheta=sqrt(2)costheta, show that costheta-sintheta=sqrt...

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  10. In a right angled triangle, the hypotenuse is four times as long as th...

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  11. If theta lies in the first quardrant and costheta=(8)/( 17 ), then fi...

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  12. Find the value of cos^(4)""(pi)/(8)+cos^(4)""(3pi)/(8)+cos^(4)""(5pi)/...

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  13. If tan(A+B)=pand tan(A-B)=q, then the value of tan2A, is

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  14. In a tringle ABC, sin A-cosB=cosC, then angle B, is

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  15. If theta lies in the first quadrant which of the following in not true

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  16. cos2 theta+2 costheta is always

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  17. The interior angles of a polygon are in A.P. the smallest angle is 120...

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  18. The maximum and minimum values of -4le5cos theta+3cos(theta+(pi)/(3...

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  19. Prove that: sin36^0s in 72^0s in 108^0s in 144^0=5/(16)dot

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  20. If A=tan6^0tan42^0 and B=cot66^0cot78^0 , then

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