4cos²(π/4)
Using the unit circle, you can get that cos(π/4) = √(2)/2:
4(√(2) / 2)²
= 4(2/4)
= 2
4cos^2(pi/4) = 4(cos(pi/4))^2 = 4(sqrt(2)/2)^2 = 4(2/4) = 2
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4cos²(π/4)
Using the unit circle, you can get that cos(π/4) = √(2)/2:
4(√(2) / 2)²
= 4(2/4)
= 2
4cos^2(pi/4) = 4(cos(pi/4))^2 = 4(sqrt(2)/2)^2 = 4(2/4) = 2