The function f is defined by f(x)=x3+2sin(3x−3). 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+2sin(3x−3). 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 and Slope: To find the equation of the tangent line to the graph of the function at x=0.5, we first need to calculate the derivative of the function, which will give us the slope of the tangent line at that point.The derivative of f(x)=x3+2sin(3x−3) is f′(x)=3x2+6cos(3x−3).Now we need to evaluate this derivative at x=0.5.
Evaluate Derivative at x=0.5: Calculating the derivative at x=0.5 gives us f′(0.5)=3(0.5)2+6cos(3(0.5)−3). This simplifies to f′(0.5)=3(0.25)+6cos(1.5−3). Further simplifying, we get f′(0.5)=0.75+6cos(−1.5). Using a calculator, we find cos(−1.5) and multiply it by 6, then add 0.75 to get the slope of the tangent line.
Calculate Slope of Tangent Line: Using a calculator, cos(−1.5)≈0.0707 (rounded to four decimal places for intermediate calculation).Now we calculate 6×0.0707+0.75.This gives us 0.4242+0.75=1.1742.So, the slope of the tangent line at x=0.5 is approximately 1.174 (rounded to three decimal places).
Find y-coordinate at x=0.5: Next, we need to find the y-coordinate of the point on the graph of f(x) at x=0.5 to determine the point through which the tangent line passes.We calculate f(0.5)=(0.5)3+2sin(3(0.5)−3).This simplifies to f(0.5)=0.125+2sin(1.5−3).Further simplifying, we get f(0.5)=0.125+2sin(−1.5).Using a calculator, we find sin(−1.5) and multiply it by 2, then add 0.125 to get the y-coordinate.
Calculate y-coordinate: Using a calculator, sin(−1.5)≈−0.9975 (rounded to four decimal places for intermediate calculation).Now we calculate 2×(−0.9975)+0.125.This gives us −1.995+0.125=−1.87.So, the y-coordinate of the point on the graph of f(x) at x=0.5 is approximately −1.87 (rounded to two decimal places).
Use Point-Slope Form: Now we have the slope of the tangent line m=1.174 and a point on the tangent line (0.5,−1.87). We can use the point-slope form of the equation of a line to find the equation of the tangent line: y−y1=m(x−x1). Plugging in our values, we get y−(−1.87)=1.174(x−0.5).
Simplify Equation: Simplifying the equation, we get y+1.87=1.174x−0.587. Then, we subtract 1.87 from both sides to get the final equation of the tangent line: y=1.174x−0.587−1.87.
Final Tangent Line Equation: Combining like terms, we get y=1.174x−2.457. This is the equation of the tangent line to the graph of f(x) at x=0.5, rounded to three decimal places.
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