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[" 4.If "a(1),a(2),a(3),...,a(87),a(88),...

[" 4.If "a_(1),a_(2),a_(3),...,a_(87),a_(88),a_(89)" are the arithmetic means "],[" between "1" and "89," then "sum_(r=1)^(89)log(tan(a_(r))^(@))" is equal to "],[[" (a) "0," (b) "1," (c) "log_(2)3," (d) "log5]]

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