Express sin(3theta) in terms of sin (theta)

First of all:-

3∅ can be called (2∅+∅)
so, sin(3∅) = sin(2∅ + ∅)
Open brackets on the RHS (right hand side)
 = sin2∅ cos ∅ + cos2∅sin∅
This is simplified into;
 = 2sin∅cos^2∅ + sin∅ (1- 2sin^2∅)
 = sin∅ (2cos^2∅ + 1 - 2sin^2∅)
 = sin∅ (2(1 - sin^2∅) +1-2sin^2∅)
 = 3sin∅ - 4sin^3∅

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles