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4(sin4 30 + cos4 60) - 23 ( sin2 60 - cos2 45) + 12 tan2 60 |
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Answer» = 4(sin4 30 + cos4 60) - 23 ( sin2 60 - cos2 45) + 12 tan2 60 = 4 ( (1/2)4 + (1/2)4 ) - 23 ( (√3/2)2 - (1/√2)2 ) + 12 (√3)2 = 4 ( 1/16 + 1/16 ) - 23 ( 3/4 - 1/2 ) + 12 x 3 = 4 ( 2/16 ) - 23 ( 1/4 ) + 36 = 1/2 - 23/4 + 36 = (2-23+154)/ 4 = (156-23)/4 = 133/4 |
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