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Prove that -4(sin^4 30°+cos^4 60°) -3(cos^2 45°- sin^2 90°) = 2 |
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Answer» HELLO DEAR, 4(SIN⁴30 + COS⁴60) - 3(COS²45 - SIN²90) => 4[(1/2)⁴ + (1/2)⁴] - 3] - 3[(1/√2)² - (1)² ] => 4[1/16 + 1/16] - 3(1/2 - 1) => 4× 2/16 - 3× (-1/2) => 1/2 + 3/2 => 4/2 = 2 I HOPE ITS HELP YOU DEAR, THANKS |
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