a Express 120 degree in radian measure b Express 3 pi2 in de

(a) Express 120 degree in radian measure. b) Express 3 pi/2 in degree measure. Fill in the entries of the following chart: Evaluate (a) cos 3 pi/2 (b) tan 2 pi/3 (c) sec (-pi/4) (d) tan^-1(- squareroot 3)

Solution

1.120°

120*pi/180=2pi/3radian

3pi/2

3pi/2 * 180/pi=270°

2.

Theta	30	45	60
Sin	1/2	sqrt2/2	sqrt3/2
Cos	sqrt3/2	sqrt2/2	1/2
Tan	1/sqrt3	1	sqrt3