a) cos2theta
b) cos^2theta
c) cos(-theta)
As Theta = 3pi/4
Cos2theta = Cos 3pi/2 = 0
Cs^2 Theta = Cos^2 3pi/4 =(-1/√2)^2 = 1/2
Cos ( -Theta ) = Cos theta = Cos 3pi/4 = -1/√2
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