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  • Question
  • The Value of logtan10+logtan20+??+logtan890 is


  • Options
  • A. -1
  • B. 0
  • C. 1/2
  • D. 1

  • Correct Answer


  • Explanation

    =   log   tan 1 0 + log   tan 89 0   +   log   tan 2 0 +   log   tan 88 0 + ? ? + log   tan 45 0   

     

    =   log   [ tan 1 0   ×   tan 89 0 ]   +   log   [ tan 2 0   ×   tan 88 0   ]   + ? ? + log 1   

     

    ?   tan ( 90 - ? ) = c o t ?   a n d   tan   45 0 = 1   

     

    = log 1 + log 1 +.....+log 1 

     

    = 0.


  • Logarithm problems


    Search Results


    • 1. Find value of log27 +log 8 +log1000log 120

    • Options
    • A. 1/2
    • B. 3/2
    • C. 2
    • D. 2/3
    • Discuss
    • 2. What is the characteristic of the logarithm of 0.0000134?

    • Options
    • A. 5
    • B. -5
    • C. 6
    • D. -6
    • Discuss
    • 3. For x?N, x>1 , and p=logxx+1 , q=logx+1x+2 then which one of the following is correct?

    • Options
    • A. p < q
    • B. p = q
    • C. p > q
    • D. can't be determined
    • Discuss
    • 4. if logab+logba=loga+b,then

    • Options
    • A. a + b = 1
    • B. a - b = 1
    • C. a = b
    • D. ab=1
    • Discuss
    • 5. If log8x = 313 then find the value of x?

    • Options
    • A. 25
    • B. 32
    • C. 37
    • D. None of these
    • Discuss
    • 6. The value of 13log10125 - 2log104 + log1032 :

    • Options
    • A. 0
    • B. 1
    • C. 2
    • D. 4/5
    • Discuss
    • 7. If log330 = 1a and log530=1b then the value of 3log302 is:

    • Options
    • A. 3(1+a+b)
    • B. 2(1-a-b)
    • C. 3(1-a-b)
    • D. 3(1+a-b)
    • Discuss
    • 8. Find x if log1218 = log24x + 1. log24x+1 + 4

    • Options
    • A. 0
    • B. 1
    • C. 2
    • D. None of these
    • Discuss
    • 9. The value of x satisfying the following relation: log12x = log23x-2

    • Options
    • A. 1/3
    • B. -1/3
    • C. 3
    • D. None of these
    • Discuss
    • 10. The value of log2log5625 is :

    • Options
    • A. 2
    • B. 5
    • C. 10
    • D. 15
    • Discuss


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