Qu 1 - STELLA'S CLASSROOM

sin 2x f(x) = —3 + cos2x Rx), where f(x) The curve has a mimmum turmng point at P and a maximum turning point at Q, as shown in Figure 5. (a) Show that the x coordinate ofP and the x coordinate of Q are solutions of the equation cos2x = (4) x 4 + 2x f(x) x ................
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