1.

4(sin^4 30 + cos^4 60 ) - 3(cos^2 45 - sin square 90) + 5cos square 90

Answer»

Step-by-step explanation:

4(sin⁴30°+cos⁴60)-3(cos²45°-sin²90°)+5cos²90

4{(1/2)⁴ +(1/2)⁴ -3{(1/√2)² -(1)² +5×0

4{(1/8)-3(-1/2)

4/8+3/2

because 4/8=1/2

so

1/2+3/2

4/2

2



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