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    5. The value of logtan1° + logtan2° +....+logtan89° is:

    Question

    The value of logtan1° + logtan2° +....+logtan89°

    is:
    A -1 Correct Answer Incorrect Answer
    C 1 Correct Answer Incorrect Answer
    D π/2 Correct Answer Incorrect Answer

    Solution

    Using the property: log ⁡ (tan ⁡ x)+log ⁡ (tan ⁡ (90 °− x))=0\log (\tan x) + \log (\tan (90 ° - x)) = 0log(tanx)+log(tan(90 °− x))=0 Pairs like log(tan1 ° ) + log(tan89 ° ) = 0 cancel out, resulting in a total sum of 0 .

    Practice Next
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