1.

The value of `sum_(r=1)^(89)log_(10)(tan((pir)/180))` is equal toA. 10B. 1C. 0D. none of these

Answer» Correct Answer - C
We have,
`sum_(r = 1)^(89)"log"_(10) "tan" (pi r)/(180)`
`= "log"_(10){"tan" (pi)/(180) xx "tan" (2pi)/(180) xx…xx "tan" (48 pi)/(180) xx…xx "tan" (89pi)/(180)}`
` ="log"_(10) 1 =0`


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