Find the period and the amplitude. y = -cos (8x/17) STEP 1: Rewrite the trigonometric expression...

 

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Find the period and the amplitude. y = -cos (8x/17) STEP 1: Rewrite the trigonometric expression in the form y = a cos (bx). y = -cos (8x/17) = cos ( x) STEP 2: Find the period of y by dividing 2π by b. Does this period represent a horizontal stretching of the graph of y = a cos (x) or a horizontal shrinking of the graph of y = a cos (x)? O horizontal stretching O horizontal shrinking STEP 3: Will the amplitude of y be positive or negative? O Positive, because both 8 and 17 are positive. O Negative, because the leading coefficient of y is negative. O Positive, because amplitude measures a distance. O Positive, because the leading coefficient of y is negative. O Negative, because both 8 and 17 are positive. Find the amplitude of y. Find the period and the amplitude. y = -cos (8x/17) STEP 1: Rewrite the trigonometric expression in the form y = a cos (bx). y = -cos (8x/17) = cos ( x) STEP 2: Find the period of y by dividing 2π by b. Does this period represent a horizontal stretching of the graph of y = a cos (x) or a horizontal shrinking of the graph of y = a cos (x)? O horizontal stretching O horizontal shrinking STEP 3: Will the amplitude of y be positive or negative? O Positive, because both 8 and 17 are positive. O Negative, because the leading coefficient of y is negative. O Positive, because amplitude measures a distance. O Positive, because the leading coefficient of y is negative. O Negative, because both 8 and 17 are positive. Find the amplitude of y.