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4 ( sin^4 30 + cos^2 ( 90-30) ) -3 ( cos^2 45 - sin^2 90) - sin^2 60
= 4 ( sin^4 30 + sin^2 30) - 3 ( 1/2 - 1) - 3/4
Now sin 30 = 1/2
4 ( 1/16 + 1/4 ) +3/2 - 3/4
4 ( 5/16) + 3/4
5/4 +3/4
2
= 4 ( sin^4 30 + sin^2 30) - 3 ( 1/2 - 1) - 3/4
Now sin 30 = 1/2
4 ( 1/16 + 1/4 ) +3/2 - 3/4
4 ( 5/16) + 3/4
5/4 +3/4
2
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