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cos1^@ . cos2^@ . cos3^@.........cos179^...

` cos1^@ . cos2^@ . cos3^@.........cos179^@` is equal to :

Text Solution

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`cos90^(@)` whose value is zero lies in between cos`1^(@)cos2^(@) cos3^(@). . .cos179^(@)` `:. cos1^(@)cos2^(@)cos3^(@). . .cos 179^(@)`
`=cos1^(@)cos2^(@)cos3^(@). . .cos90^(@). . . . cos179^(@)`
`= cos1^(@)cos2^(@)cos3^(@). . . . xx0xx. . . . cos179^(@)`
`=0` (`:'` `0xx` finite number =0)
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