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Value of sin^2 11 (1/4)^@ + cos^4 11 (1/...

Value of `sin^2 11 (1/4)^@ + cos^4 11 (1/4)^@=`

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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^(@)) .

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if cos alpha=(11)/(61) and sin beta=(4)/(5), find the values of sin^(2)((alpha-beta)/(2)) and cos^(2)((alpha+beta)/(2))

Simplify : 11^(1/2)/11^(1/4)