1.

The value of the expression (1+cot7^(@))(1+cot9^(@))(1+cot11^(@))......(1+cot45^(@))(1-cot52^(@))(1-cot54^(@))......(1-cot88^(@)) is equal to

Answer»

`2^(18)`
`2^(19)`
`2^(20)`
`2^(21)`

SOLUTION :Using`(1+costheta)(1-cot(45^(@)+THETA))=2`
` (1+cot45^(@))(2^(19))=(2^(19))=20^(20)`


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