1.

16cos^(6)10^(@)-24cos^(4)10^(@)+9cos^(2)10^(@) is equal to

Answer»

`1/4`
`3/4`
`1/2`
`1`

Solution :GIVEN expression `=(4cos^(3)10^(@)-3COS^(@))^(2)`
`=(COS30^(@))^(2)`
`=3/4`


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