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The function 
f is defined by 
f(x)=x^(3)-2cos(2x^(2)+2). Use a calculator to write the equation of the line tangent to the graph of 
f when 
x=0.5. You should round all decimals to 3 places.
Answer:

The function f f is defined by f(x)=x32cos(2x2+2) f(x)=x^{3}-2 \cos \left(2 x^{2}+2\right) . Use a calculator to write the equation of the line tangent to the graph of f f when x=0.5 x=0.5 . You should round all decimals to 33 places.\newlineAnswer:

Full solution

Q. The function f f is defined by f(x)=x32cos(2x2+2) f(x)=x^{3}-2 \cos \left(2 x^{2}+2\right) . Use a calculator to write the equation of the line tangent to the graph of f f when x=0.5 x=0.5 . You should round all decimals to 33 places.\newlineAnswer:
  1. Calculate Derivative: To find the equation of the tangent line at x=0.5x = 0.5, we first need to calculate the derivative of f(x)f(x), which will give us the slope of the tangent line at any point xx. The derivative of f(x)=x32cos(2x2+2)f(x) = x^3 - 2\cos(2x^2 + 2) is f(x)=3x2+4xsin(2x2+2)f'(x) = 3x^2 + 4x\sin(2x^2 + 2).
  2. Find Slope at x=00.55: Next, we evaluate the derivative at x=0.5x = 0.5 to find the slope of the tangent line at that point.f(0.5)=3(0.5)2+4(0.5)sin(2(0.5)2+2).f'(0.5) = 3(0.5)^2 + 4(0.5)\sin(2(0.5)^2 + 2).
  3. Find y-coordinate at x=00.55: Performing the calculations, we get:\newlinef(0.5)=3(0.25)+2sin(2(0.25)+2)=0.75+2sin(2.5)f'(0.5) = 3(0.25) + 2\sin(2(0.25) + 2) = 0.75 + 2\sin(2.5).\newlineUsing a calculator, we find sin(2.5)0.598\sin(2.5) \approx -0.598.\newlineSo, f(0.5)0.75+2(0.598)0.751.1960.446f'(0.5) \approx 0.75 + 2(-0.598) \approx 0.75 - 1.196 \approx -0.446.\newlineWe round this to three decimal places, getting f(0.5)0.446f'(0.5) \approx -0.446.
  4. Write Point-Slope Equation: Now we need to find the yy-coordinate of the function at x=0.5x = 0.5 to get the point through which the tangent line passes.f(0.5)=(0.5)32cos(2(0.5)2+2)=0.1252cos(3).f(0.5) = (0.5)^3 - 2\cos(2(0.5)^2 + 2) = 0.125 - 2\cos(3).Using a calculator, we find cos(3)0.990\cos(3) \approx -0.990. So, f(0.5)0.1252(0.990)0.125+1.9802.105f(0.5) \approx 0.125 - 2(-0.990) \approx 0.125 + 1.980 \approx 2.105. We round this to three decimal places, getting f(0.5)2.105f(0.5) \approx 2.105.
  5. Convert to Slope-Intercept Form: With the slope of the tangent line and the point (0.5,2.105)(0.5, 2.105), we can use the point-slope form of the equation of a line to write the equation of the tangent line.\newlineThe point-slope form is yy1=m(xx1)y - y_1 = m(x - x_1), where mm is the slope and (x1,y1)(x_1, y_1) is the point on the line.\newlineSubstituting our values, we get y2.105=0.446(x0.5)y - 2.105 = -0.446(x - 0.5).
  6. Convert to Slope-Intercept Form: With the slope of the tangent line and the point (0.5,2.105)(0.5, 2.105), we can use the point-slope form of the equation of a line to write the equation of the tangent line.\newlineThe point-slope form is yy1=m(xx1)y - y_1 = m(x - x_1), where mm is the slope and (x1,y1)(x_1, y_1) is the point on the line.\newlineSubstituting our values, we get y2.105=0.446(x0.5)y - 2.105 = -0.446(x - 0.5).To write the equation in slope-intercept form, we simplify the equation:\newliney=0.446x+0.223+2.105y = -0.446x + 0.223 + 2.105.\newlineCombining like terms, we get y=0.446x+2.328y = -0.446x + 2.328.\newlineWe round the constants to three decimal places, so the final equation is y0.446x+2.328y \approx -0.446x + 2.328.

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