Find the value of `(4cos^(2)9^(@)-1)(4cos^(2)27^(@)-1)`
`(4cos^(2)81^(@)-1)(4cos^(2)243^(@)-1)`.

Find the value of log_(sqrt(3))((4cos^(2)9^(@)-1)(4cos^(2)27^(@)-1)(4cos^(2)81^(@)-1)(4cos^(2)243^(@)-1))

Find the value of sin(1/4cos^(-1)((-1)/9))

Find the value of sin(1/4cos^(-1)((-1)/9))

Find the value of sin(1/4cos^(-1)((-1)/9))

Prove that (4cos^(2)9^(@)-3)(4cos^(2)27^(@)-3)=tan9^(@)

Prove that (4cos^(2)9^(@)-3)(4cos^(2)27^(0)-3)=tan9^(@)

Find the value of 5tan^(2)30^@+4cos^(2)45^@-sin^(2)60^@+1

Find the value of (cos^(4)1^(@)+cos^(4)2^(@)+cos^(4)3^(@)+......+cos^(4)179^(@))-(sin^(4)1^(@)+sin^(4)2^(@)+sin^(4)3^(@)+.......+sin^(4)179^(@)) .

Find the value of cos^(-1)(cos((4pi)/(3)))+cos^(-1)(cos((5pi)/(4)))