9. How many solutions exist for sin x cos x = 0 in the interval x Є [0,π]? a. 2 b. 3 C. 4 d. 5 10. A sprinkler system is programed using the equation y=15sin(kt) where t is time in seconds. If the period is seconds, what is the value of k? a. 5π 3 b. 36 3π C. 56 5π σπ d. 3 65

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