5 derive the formulas for the derivatives of the trigonometr

5. derive the formulas for the derivatives of the trigonometric functions. Here we The area of a sector of a circle of radius r subtended by an angle is given by r and the length of the arc subtended is given by rt, where is measured in radians. Consider a circle of radius 1 with central angle . Use Figure 5-2 to argue that (a) sin cos

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