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What is the period of 
y=3cos(x-7)+2 ?
Give an exact value.
units

What is the period of y=3cos(x7)+2 y=3 \cos (x-7)+2 ?\newlineGive an exact value.\newlineunits

Full solution

Q. What is the period of y=3cos(x7)+2 y=3 \cos (x-7)+2 ?\newlineGive an exact value.\newlineunits
  1. Identify function and period: Identify the basic function and its period.\newlineThe basic function here is cos(x)\cos(x), which has a period of 2π2\pi.
  2. Coefficient of xx: Determine if the coefficient of xx affects the period.\newlineThe coefficient of xx inside the cosine function is 11 (since it's (x7)(x-7), equivalent to 1×(x7)1\times(x-7)). This does not affect the period of the cosine function.
  3. Other factors affecting period: Determine if there are any other factors that affect the period.\newlineThe function y=3cos(x7)+2y=3\cos(x-7)+2 has a vertical stretch factor of 33 and a vertical shift of +2+2, but these do not affect the period of the function. The horizontal shift of 7-7 also does not affect the period.
  4. Conclude the period: Conclude the period of the given function.\newlineSince the period of the basic cosine function is 2π2\pi and there are no factors in y=3cos(x7)+2y=3\cos(x-7)+2 that affect the period, the period of the given function is also 2π2\pi.

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