The function f is defined by f(x)=x3−2cos(2x2+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:
Q. The function f is defined by f(x)=x3−2cos(2x2+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:
Calculate Derivative: To find the equation of the tangent line at x=0.5, we first need to calculate the derivative of f(x), which will give us the slope of the tangent line at any point x. The derivative of f(x)=x3−2cos(2x2+2) is f′(x)=3x2+4xsin(2x2+2).
Find Slope at x=0.5: Next, we evaluate the derivative at x=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).
Find y-coordinate at x=0.5: Performing the calculations, we get:f′(0.5)=3(0.25)+2sin(2(0.25)+2)=0.75+2sin(2.5).Using a calculator, we find sin(2.5)≈−0.598.So, f′(0.5)≈0.75+2(−0.598)≈0.75−1.196≈−0.446.We round this to three decimal places, getting f′(0.5)≈−0.446.
Write Point-Slope Equation: Now we need to find the y-coordinate of the function at x=0.5 to get the point through which the tangent line passes.f(0.5)=(0.5)3−2cos(2(0.5)2+2)=0.125−2cos(3).Using a calculator, we find cos(3)≈−0.990. So, f(0.5)≈0.125−2(−0.990)≈0.125+1.980≈2.105. We round this to three decimal places, getting f(0.5)≈2.105.
Convert to Slope-Intercept Form: With the slope of the tangent line and the point (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.The point-slope form is y−y1=m(x−x1), where m is the slope and (x1,y1) is the point on the line.Substituting our values, we get y−2.105=−0.446(x−0.5).
Convert to Slope-Intercept Form: With the slope of the tangent line and the point (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.The point-slope form is y−y1=m(x−x1), where m is the slope and (x1,y1) is the point on the line.Substituting our values, we get y−2.105=−0.446(x−0.5).To write the equation in slope-intercept form, we simplify the equation:y=−0.446x+0.223+2.105.Combining like terms, we get y=−0.446x+2.328.We round the constants to three decimal places, so the final equation is y≈−0.446x+2.328.
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