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4 ( sin^4 60 + cos^4 30 ) - 3 ( tan^2 60 - tan^2 45 ) + 5cos^2 45
= 4 { (root3/2)^4 + ( root3/2 )^4 } - 3 {( root3 )^2 - (1)^2 } + 5 ( 1/root2 )^2
= 4 × 6/4 - 3 × 2 + 5 × 1/2
= 6 - 6 + 5/2
= 5/2
= 4 { (root3/2)^4 + ( root3/2 )^4 } - 3 {( root3 )^2 - (1)^2 } + 5 ( 1/root2 )^2
= 4 × 6/4 - 3 × 2 + 5 × 1/2
= 6 - 6 + 5/2
= 5/2
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hope this will help u....
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