Remember: The formula for the period only cares about the coefficient, $$ \color{red}{a} $$ in front of the x. The formula for the period is the coefficient is 8 : $$ -7 cos (\color{red}{8}x) $$. $ period = \frac{2 \pi}{ \color{red}{a}} \\ period = \frac{2 \pi}{ 8} \\ period = \frac{ \pi}{4} $.
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Upon opening the new version of the Microsoft Solitaire Collection thatâs bundled in with Windows 10, users will be greeted with an ad that prompts them to upgrade to the premium edition of the game â at a cost of $1.49 per month, or $9.99 for an annual subscription, according to a report from Business Insider.