Hey I need a second opinion to see if my formulas and calculations are correct. Also I need help with graphing this problem.(adsbygoogle = window.adsbygoogle || []).push({});

My problem is to find amplitude, period, horizontal shift, vertical translation, step and then graph of:

y= 2 - (1/3) cos ( πx + (3π/2) ) , -1/4 ≤ x ≤ 15/4

Using the formula:

y = A cos ( Bx + C) + D

A = 2

B = π

C = 3/2

D = 0

Amplitude: |A| = 1/3

Period: ((2π) / |B|) = 2

Horizontal Shift: -C/B = (3/(2π))

Vertical Translation: D = 0

Step: ((2π)/2)/B = 1

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# Trigonometry: Graphing cos

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