if sec A-tan A = a/b
find the value of cos A.
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I believe it is RPM's (Reps Per Minute)
4 km/per hour
Divide the litres per minute by 4.55
Multiply liters per minute by 0.0353146667 to get cubic feet per minute.
-- to convert the feet to inches, multiply by 12-- to convert the minute to second, divide by 60-- combining these operations, take (feet per minute) and multiply by (12/60) = 0.2