Niwot High School

sin2x+sinx=0 b) cos2x+3cosx=1 . c) 2 cos 2 x+cosx-1=0 . 8. Use the double angle formula to show that. a) sin 2 θ= 1 2 - 1 2 cos2θ b) cos 2 θ= 1 2 + 1 2 cos2θ . ... A part of the graph of . y = 2. x – x. 2 is given in the diagram below. The shaded region is revolved through 360 about the . x ................
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