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2cos2x -2cosx 4. Which graph represents the function f(x) = —stnx in the interval g? 3. The accompanying diagram shows a section of a sound wave as displayed on an oscilloscope. Which equation could represent this graph? expression. a) y = 2 cos— cos2X b) y = 2 sin E following — sin—x trigonometric 5. Evaluate 3m cos the 6. The radian angle ................
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