π 30. Using a graphing calculator to sketch y=-1.4sin 2r- the best viewing window for one period is 3 π X Y = -1.4 X Y = -1.4 X ==0 6 = 0 min 6 6 (a) (b) (c) 137 77 Y = 1.4 Xmx = 77 X₂ = max Y = 1.4 X. Y =1.4 max max 6 6 6 X=0 Y = -1.4 X = X₂ == Yax=1.4 max (d) X. 77 (e) X || = 77 6 77 6 Y = -1.4 = 1.4 max ||

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