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The graph of a sinusoidal function has a maximum point at 
(0,7) and then intersects its midline at 
(3,3).
Write the formula of the function, where 
x is entered in radians.

f(x)=

The graph of a sinusoidal function has a maximum point at (0,7)(0,7) and then intersects its midline at (3,3)(3,3).\newlineWrite the formula of the function, where xx is entered in radians.\newlinef(x)=f(x)=

Full solution

Q. The graph of a sinusoidal function has a maximum point at (0,7)(0,7) and then intersects its midline at (3,3)(3,3).\newlineWrite the formula of the function, where xx is entered in radians.\newlinef(x)=f(x)=
  1. Given Points Information: We are given a maximum point at (0,7)(0,7) and a midline intersection at (3,3)(3,3). The maximum point gives us the amplitude and the vertical shift, while the midline intersection gives us the horizontal shift and the period.
  2. Calculate Amplitude: The amplitude AA is the distance from the midline to the maximum point. Since the midline is at y=3y = 3 and the maximum is at y=7y = 7, the amplitude is 73=47 - 3 = 4.
  3. Calculate Vertical Shift: The vertical shift DD is the yy-value of the midline, which is 33.
  4. Determine Sinusoidal Function Form: The sinusoidal function will have the form f(x)=Asin(B(xC))+Df(x) = A \cdot \sin(B(x - C)) + D or f(x)=Acos(B(xC))+Df(x) = A \cdot \cos(B(x - C)) + D. Since the maximum point is at x=0x = 0, we will use the cosine function, which has a maximum at x=0x = 0 when there is no horizontal shift (C=0C = 0).
  5. Find Period of Function: Now we need to find the period TT of the function. The graph intersects the midline at (3,3)(3,3), which is a quarter of the period after the maximum. Therefore, the full period is 44 times this value, so T=4×3=12T = 4 \times 3 = 12 radians.
  6. Calculate B Value: The value BB in the function f(x)=Acos(B(xC))+Df(x) = A \cdot \cos(B(x - C)) + D is related to the period by the formula B=2πTB = \frac{2\pi}{T}. So B=2π12=π6B = \frac{2\pi}{12} = \frac{\pi}{6}.
  7. Final Sinusoidal Function: Putting all the values together, we get the sinusoidal function: f(x)=4cos(π6(x0))+3f(x) = 4 \cdot \cos\left(\frac{\pi}{6} \cdot (x - 0)\right) + 3.

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