1.

`log_(10)tna 1^(@) + log_(10) tan 2^(@) + ...+ log _(10) tan 89^(@)` बराबर है

Answer» Correct Answer - A
`log tan 89^(@) = log cot 1^(@) = - log tan 1^(@)`
` :. log tan 1^(@) + log tan 2^(@)`
` + ...+ log tan 44^(@) + log tan 45^(@)`
` - log tan 44^(@) - ...- log tan 2^(@)`
` - log tan 1^(@) = log tan 45^(@) = log 1 = 0`


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