Question

evaluate- 2/3(cos^4 30 degree-sin^4 45degree)-3(sin^2 60 degree-sec^2 45 degree)+1/4 cot^2 36 degree
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Answer 1

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Step-by-step explanation:

2/3 * ( (√3/2)⁴ - (1/√2)⁴ ) - 3 * ( (√3/2)² - (√2)² ) + 1/4 * (√3)²

2/3 ( 9/16 - 1/4 ) - 3 * ( 3/4 - 2 ) + 3/4

2/3 * 5/16 + 15 / 4 + 3/4

5 /24 + 9/2

113/24