3 a b Use 31416 for unless your calculator has a key marked

3

a)

b)

Use 3.1416 for unless your calculator has a key marked . Use a calculator to convert 1\' (1 minute) to radians to three significant digits. rad

Solution

1 minute = 1/60 degree

we know : 1 degree = pi/180 radians

So, 1 minute = (1/60)*(pi/180) = 0.000291 radians

csc(7pi/6) = 1/sin(7pi/6)

sin(7pi/6) = sin( pi +pi/6) = -sinpi/6 = -1/2

csc(7pi/6) = 1/sin(7pi/6) = -2