1.

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

Answer»

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

Solution :Given expression =`(4 cos^3 10^@ - 3cos10^@)^2`
`=(cos30^@)^2`
`=3/4`


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